List of Differences Between the Harry Potter Books and Films

Below are a **list of changes** made to the stories of the Harry Potter books when they were adapted into feature films. They occur for a number of reasons, one of them being that films require the story to be significantly shortened (such as the removal or shortening of various sub-plots that are irrelevant to the main story).

## General

### 1. House Points

* In the films, House Points play a major role only in the *Philosopher's Stone*. In the other films, almost all mention of house points are omitted (except for two instances, one in *Prisoner of Azkaban* where Snape takes 5 points from Gryffindor, and the other in *Chamber of Secrets*, when Professor Sprout gives 10 points to Gryffindor).

### 2. Missing Characters

* There are many characters that play a secondary or even active role in the books, that are completely omitted or mentioned only. These include:
	+ Charles Weasley
	+ Charlotte Potter
	+ Peeves
	+ Ludovic Bagman
	+ Bertha Jorkins
	+ Cuthbert Binns
	+ Andromeda and Ted Tonks
	+ Hestia Jones
	+ Marietta Edgecombe
	+ Winky
	+ Marlene McKinnon
	+ Phineas Nigellus Black

### 3. Invisibility Cloak

* The Invisibility Cloak is used occasionally in the films, but it sees a lot more usage in the books.

### 4. Classes

* With the exception of the first classes that Harry attends in *Philosopher's Stone* and most of the classes that introduce a new teacher (the first Defence Against the Dark Arts class from years 2-5, the first Care of Magical Creatures class and first Divination class in Prisoner of Azkaban, and the first Potions class in Half-Blood Prince) classes do not play a major role. Most of the classes that Harry attends in the books are omitted from the films. Throughout the films we only see one Charms lesson, one Care of Magical Creatures lesson, no more than one Defence Against the Dark Arts lesson in each films except for *Prisoner of Azkaban*, no History of Magic lessons, no Potions lessons outside of the first and sixth films (not including the Potions scene from *Order of the Phoenix* that last for 5 seconds), and no Transfiguration lesson outside the second film (we see the Transfiguration class in the first film but not the actual lesson).

## Philosopher's Stone

### 1. The Boy Who Lived

* The film begins with Harry's arrival at Privet Drive. As a result, everything that precedes this point in the book is omitted in the film, which includes:
	+ Vernon Dursley's day at Grunnings and his encounter with the wizards during his lunch break on the day before Harry arrived.
	+ Vernon Dursley noticing Minerva McGonagall in her Animagus form earlier in the day, thinking she was reading a map.
	+ The existence of Ted and Jim McGuffin.
* At the start of the novel, Minerva McGonagall in her Animagus form had been observing Vernon Dursley prior to her meeting with Dumbledore and Hagrid. While this scene was omitted from the film, it was referenced when McGonagall voiced her objections in leaving Harry in the Dursley's case when she said she had "watched them all day."
* In the film, when Albus Dumbledore leaves Harry Potter on the doorstep of the Dursleys' house, he says, "Good luck, Harry Potter." In the book, he just says, "Good luck, Harry." This is likely because of the aforementioned omissions.

### 2. The Vanishing Glass

* When Dudley counts the presents in the book, he says there are 36 and that is two less than last year, although Aunt Petunia then shows him the present has has missed out. In the film, it was Uncle Vernon who counted the presents, and while the count remains at 36, Dudley had 37 presents last year instead of 38.
* In the book, the Dursleys and Harry are accompanied to the zoo by Dudley's friend Piers Polkiss. He is omitted in the film.
	+ Due to Piers' omission, Vernon Dursley recognised that Harry was responsible for what happened to Dudley in the reptile house due to the smile on his face. In the book, Piers saw Harry talk to the snake and reported to Vernon after the incident.
* The Dursleys attempting to have Harry stay with Arabella Figg is omitted, as well as the mention of her having broken her leg and also the possibilities of Harry being watched by Vernon's sister, Marge who hates Harry and Petunia's friend, Yvonne who is on vacation in Majorca.
* In the book, before going to the zoo, Vernon tells Harry that if any funny stuff happens he will be in the cupboard from then until Christmas. In the film, Vernon tells Harry that if any funny business happens, he won't have any meals for a week (although this happens in the book after the zoo incident, when Vernon says to Harry to go to his cupboard and stay there with no meals).
* In the book, when the glass of the snake tank vanished, Dudley and Piers leapt backwards in horror and ran away as the snake escaped its captivity. In the film, when the glass vanished, Dudley fell into the tank and got trapped in there as the snake escaped.
* In the book, the glass of the snake tank remains vanished. In the film it returns, trapping Dudley in the tank.
	+ On a similar note, Vernon comes across as slightly angrier with Harry in the film to the extent of trying to violently interrogate him and then physically shoving the latter into the cupboard upon returning him due to deducing Harry's role in trapping Dudley.
* The Keeper of the reptile house who asks where the glass went is omitted from the film since the glass came back and trapped Dudley inside the tank.
* Harry states in the second film that the snake at the zoo was a python. The snake at the zoo is said to be from Burma. In the novel, it is a boa constrictor from Brazil, not a python from Burma. However, both the novel and the film reveal the snake was bred in captivity.
* In the book, the snake addressed Harry as "amigo" when thanking him for freeing it. In the film, the snake simply says "thanks."
* In the film, Vernon pulls Harry by the hair asking Harry what had happened: when Harry yells and explains, he is thrown into and locked in the cupboard by his uncle, who says to him through a small vent: "There's no such thing as magic!" This does not happen in the book, although Vernon orders Harry to remain in the cupboard with barely restrained rage.

### 3. The Letters From No One

* Dudley appears to know about Hogwarts, as he stares worriedly at Harry like his parents do. In the books, Dudley does not know about magic when Harry gets his letter.
* Harry does not get Dudley's second bedroom until the second film, with the latter film implying that the Dursley's supplied Harry with the room after his first year.
* The scene where Harry and the Dursleys go to a random hotel to get away from the letters was omitted from the film, so instead they went straight to the hut.
	+ Because of this, Dudley's line of "Daddy's gone mad, hasn't he?!" was moved to immediately after Uncle Vernon declares that they are going to move far enough away to ensure that the owls can't find them. In the book, Dudley says this line only after Vernon pauses driving long enough to do a glance around to see if any owls are following them on a bridge.
* The scene with Harry and the Dursleys using the rowboat of the toothless old man to get to the hut is omitted; therefore, the old man is also omitted from the film, but he appears in concept artwork only.

### The Keeper of the Keys

* In the book, when Hagrid first met Harry on the island he knew who he was right away, while in the film Hagrid initially mistook Dudley for Harry until Dudley corrected him.
* In the book, Vernon warns Dudley not to receive or eat anything that Hagrid gives him when he was making sausages for Harry. In the film, Vernon doesn't mention this to Dudley, as Dudley is later seen eating some of Harry's birthday cake, which Hagrid makes him stop by giving him the pig's tail.
* In the book, Hagrid grabs the gun and ties it into a knot. In the film he grabs the barrel of the gun and bends it upwards only. The film also has the gun discharging shortly afterward, something that never happens in the book.
* Harry's birthday cake is depicted differently in the book and film. The book reveals it as a round chocolate cake with chocolate frosting and has green icing which spells "Happy Birthday Harry" while the film depicts it also as a round cake having the same green icing but with the "*birthday*" spelled as "*birthdae*" and the frosting being pink. The cake's flavour is also not mentioned, although it is possibly a chocolate cake frosted in strawberry, hence the pink colour.
* In the book, Harry does not say "Thank you" to Hagrid when he gives him the cake, but in the film, he does.
* In the book, Hagrid immediately curses Dudley into getting a pig's tail when he is angered by Uncle Vernon insulting Dumbledore and threatens him. In the film, while he also angrily threatens Vernon for insulting Dumbledore, Hagrid only curses Dudley after noticing him devouring Harry's cake without his (Harry's) consent.
* Hagrid never tells Harry about his being expelled from Hogwarts in the film.

### 5. Diagon Alley

* Hagrid tells Harry about the death of his parents while he is still with the Dursleys on the island in the sea in the book. However in the film, Harry asks about this at the Leaky Cauldron, and it is here that Hagrid tells Harry about his parents.
* In the film, Hagrid does not tell Harry that he was expelled from Hogwarts but allowed to remain as gamekeeper at the school, while he does in the book; this would not be revealed until the next film.
* This scene is also the first time Voldemort is mentioned, while in the book he is mentioned by Dumbledore and McGonagall at the beginning (though he is referenced with talk about rumours).
* In the book, Quirrell does not have his turban until after his failed attempt to steal the Philosopher's Stone from Gringotts. In the film, however, Quirrell has his turban before the robbery. This change is indicated by the fact that he shakes Harry's hand at the Leaky Cauldron in the novel, but does not wish to in the film. However, not wanting to shake Harry's hand cannot be due to Voldemort sharing Quirrell's body, because as Quirrell dies, he does not understand what is happening to him (he yells, "What is this magic?!").
* In the novel, when Harry buys his wand, Hagrid is with him. But in the film, Hagrid is not present, having gone to buy Hedwig. Also, in the novel Harry is with Hagrid when he buys Hedwig, before going to Ollivanders.
* In the book, Harry names Hedwig from a History of Magic book. In the film, it is not mentioned where the name was chosen from. Hedwig's name isn't even mentioned in the film.
* In the novel, when Harry buys his wand, he tried many wands before Ollivander thought of the holly wand, but in the film he only tried two wands before Ollivander thought of the right wand. Also in the novel, when Harry waved the wands, they didn't do anything, but in the film when he waved the wands, they blew papers and boxes off the shelves and broke a vase.
* Madam Malkin is omitted despite her name appearing on a sign.
* In the book Harry first met Draco Malfoy in Diagon Alley while shopping and later learned who he was on the Hogwarts Express, where Harry chose not to befriend him after Draco insulted Ron Weasley. In the film, both these events occur at Hogwarts before the Sorting.
* In the book Harry first hears about Quidditch from Draco Malfoy while in Diagon Alley before Hagrid explains what it is after Harry met up with him. In the film this was instead moved to Hogwarts during Harry's first flying lesson after Madam Hooch mentions it when she has to take Neville Longbottom to the hospital wing.
* In the book, following his trip to Diagon Alley, Harry spends another month with the Dursleys with Vernon driving him to the train station on the day of his departure. In the film, there is no indication of Harry returning to the Dursleys and instead seems to go straight from Diagon Alley to the train station with Hagrid.

### 6. The Journey From Platform Nine and Three-Quarters

* In the book Harry first learns about the connection between Dumbledore and Flamel on the back of his chocolate frogs card. In the film, it is Hermione who comes across the name in a book she picked up for "light reading." In a deleted scene, however, you see Harry finding the name on a chocolate frog card after which the quartet run off to the library, so it only appears as a "mistake."
* In the book, Neville comes into the compartment where Harry, Ron and Flick are sitting asking if they have seen his toad, which was omitted. Later Hermione shows up again with Neville asking the same question. In the film, Hermione shows up by herself asking if anyone has seen a toad, and that a boy named Neville has lost one.

### 7. The Sorting Hat

* In the book, before the sorting begins, the Sorting Hat sings a song, but this does not happen in the film.
* Sorting was done alphabetically in the novel, and out of order in the film. Also, only Hermione, Draco, Flick, Susan Bones, Ron and Harry are seen to be sorted in the film, although presumably the others were sorted after Harry, even though this is not shown.
* The Sorting was done by saying the students' last name and then their first name after in the book, while in the film the names are said the opposite of how they're said in the book, with their first name then their last name.
* In the book, it appears that only the person wearing the Sorting Hat can hear its deliberations with any discussion between the hat and wearing occurring non-verbally. In the film, everything the hat says is spoken out loud, and Harry whispers his desire not to be sorted into Slytherin instead of simply thinking it.
* In the novel, after the sorting, Dumbledore stands to say a few words and comically utters a few random words at which point supper begins. This is omitted in the film, with Dumbledore giving the start of term notices instead.
* Harry learns that only Slytherin go bad from Hagrid in Diagon Alley. In the film, he learns it from Ron during the Sorting ceremony.
* In the book Seamus Finnigan asks Nicholas de Mimsy-Porpington why he is called Nearly Headless Nick, while in the film Hermione is the one who asks this question instead.
* In the book Percy Weasley wears glasses but throughout the film he is seen without them.
* The character Peeves is omitted, although a scene was filmed for him, but ended up being cut. Peeves never appeared in any of the films (nor was he even mentioned).

### 8. The Potions Master

* In the book, Harry and his friends attend Charms class at some point before Potions, but in the film, they attend it much later.
* In Potions, when Harry is unable to answer Snape's questions, he says that Hermione shout try and answer instead, he takes 1 point from Gryffindor and then he loses another point for not telling Neville not to put quills into his cauldron during potion-brewing. In the film, this scene appeared as a deleted scene with Snape coming down to sit in front of Harry giving him the answers, then takes 5 points from Gryffindor for Harry's cheek and the scene with potion-brewing is completely omitted from the film and this deleted scene.

### 9. The Midnight Duel

* In the novel, during the Flying Lesson after Neville breaks his wrist, Draco Malfoy says he might leave Neville's Remembrall in a tree for him to find, but in the film he suggests to leave it on the roof.
* There is a moment added in this scene of the film that never happened in the book: while everyone is constantly repeating "Up!" to get their brooms into their hands, Ron's flies up a little too fast and hits him in the face.
* In the novel, when Professor McGonagall arrives to take Harry, she looks frustrated and Flick and Ron try to explain what happened, but in the film, McGonagall is calm and calls Harry by his name and then asks him to follow her.
* When McGonagall takes Harry inside to make him a Seeker, Oliver Wood is attending Charms with Professor Flitwick, but in the film, he is having Defence Against the Dark Arts with Professor Quirrell.
* In the film, McGonagall tells Wood she has found him a Seeker outside Quirrell's classroom, but in the novel, she takes Oliver and Harry to an empty classroom where they find Peeves writing rude words on a blackboard.
* In the novel, McGonagall mentioned to Harry in front of Oliver Wood that James Potter was a Chaser for the Gryffindor Quidditch Team when he was at Hogwarts, while in the film, Hermione escorts him (and Ron and Flick) to a trophy window where Harry sees his father's name on a trophy badge saying that he was a Seeker.
* The scene where Malfoy challenged Harry to a duel, but had actually tricked him by tipping off Filch was omitted. Instead, Harry, Ron, Flick and Hermione see Fluffy in the Forbidden Corridor after their escape from Filch and Mrs Norris when accidentally entering the third floor. In the book, Neville was also with them when first meeting Fluffy.

### 10. Halloween

* In the book, Harry's first Quidditch training session takes place at 7pm, but in the film, it starts at daytime at an unknown period. The time is unknown because the scene where Harry receives the message along with the Nimbus 2000 is cut from the film.
* In the film, when Oliver Wood was explaining the rules of Quidditch to Harry, Wood said "You catch [the Golden Snitch], Potter, and we win." However this is inaccurate because catching the Snitch only awards 150 points and if the opposing team is leading by more than 150 points, the team that caught the Snitch will lose (the odds of this happening are very low). In the book, however, Wood said, "Whichever Seeker catches the Snitch wins his team an extra hundred and fifty points, so they nearly always win" which explains it more because he said "nearly always win," not "we win."
* In the book Harry receives his broom before his first training session with Oliver Wood and before his encounter with the troll but in the film, he receives his broom after these two events occur. Due to this difference, Harry flies the Nimbus 2000 in the book during training, but in the film, he doesn't have the Nimbus 2000 or any other broom and therefore doesn't fly.
* Due to Peeves' omission from the film, Ron suggests that people are playing jokes since he states that a troll couldn't get in on its own because they're really stupid. In the book, Ron has the feeling that it could've been Peeves who let the troll in for a Halloween prank.
* During the feast, the students, having heard Quirrell's frightening complains of the troll, panic as they try to flee the Great Hall and Dumbledore silences them. The way Dumbledore silences and calms the students is different; the book depicts him drawing his wand and conjuring a spell of loud, deafening purple fireworks to frighten the students into calming down whereas the film shows him yelling out "*Silence!*" and advising everybody not to panic before adding that prefects will lead their houses to the dormitories while he will investigate the dungeons with the teachers.
* In the book, when Hermione is crying in the bathroom and Professor Quirrell announces that there is a troll in the dungeon, Harry, Ron and Flick go to find her and see the troll going into a room (Flick panics when she sees the room it goes into and is unable to speak while the boys do not realise it's the bathroom) and lock the door thinking they've locked the troll in some random room until they hear Hermione screaming and realise they've locked the troll in with her in the bathroom. In the film Harry, Ron and Flick see the troll's shadow emerging, they hide and watch the troll go into a room, and Flick says, "It's going into the girls' bathroom!" and they go in to save Hermione.
* In the book, when Ron tries to levitate his feather in Charms and is doing it incorrectly, Hermione tells him to make the *gar* nice and long, while in the film, she tells him the pronunciation is *Leviosa* not *Leviosar*.
* Also in the film, when Ron doesn't do the incantation correctly, he waves his wand up and down very quickly, when Hermione tells him to stop because he's going to take someone's eye out. This dialogue did not appear in the book.
* In the film, Seamus Finnigan's feather blows up while in Charms, and later, his cup of water blows up while he is trying to turn it into rum. The act of Seamus' works blowing up on him would become a insensitive recurring joke throughout the film series.
* Harry discovering Snape's wound on his leg occurs immediately after they dispatches the troll while McGonagall docked and rewarded 5 points to Hermione and Harry/Ron/Flick, respectively for letting the troll in (as Hermione took the heat for it to avoid getting them into trouble) and the "dumb luck" of disabling the troll, respectively, due to Snape being present and forgetting to cover up the wound. In the book, it occurred well afterwards when Harry stumbled upon it by accident while Snape was showing it to Filch.
	+ In addition, Snape compliments Harry on his flying skills the next day and even implies that he's considering rooting for Harry to do well in the match despite his favouritism towards Slytherin, something he does not do in the book.

### 11. Quidditch

* The scene with Harry in possession of the book *Quidditch Through the Ages* outside school and Snape takes it and deducts 5 points from Gryffindor is omitted. This also omits the scene where Harry tries to get the book back and Snape is showing his leg to Filch.
* In the book during the Gryffindor-Slytherin Quidditch match, Gryffindor's score is 20 and Slytherin's is 60 until Harry wins 150 points for catching the Golden Snitch. In the film, both Gryffindor and Slytherin were tied with 20 until Harry caught the Snitch which also resulted in Harry winning 150 points.
* In the book, when Hermione tries to stop Snape from jinxing Harry's broom (when it is really Quirrell), she accidentally knocks Quirrell over as she runs by him. In the film, when the other wizards near Snape see that he is on fire, one of them shoves Quirrell to the ground, breaking his eye contact.
	+ In the boom, Hermione uses Bluebell Flames to set Snape's robes alight, whereas in the film she uses *Lacarnum Inflamari*, with orange flames.
	+ In the film, after he was informed, Snape moves around to put out the fire. In the book, once Snape noticed and started moving, Hermione secretly moved the blue flame to a jar so Snape would not know the truth of what happened to conceal her involvement.
* In the book, Hagrid says that he bought Fluffy from a "Greek chappie" while in the film, Hagrid says that he bought Fluffy from an "Irish feller."

### 12. The Mirror of Erised

* Irma Pince is omitted.
* Fred and George Weasley having bewitched several snowballs to follow Quirrell around and then to hit him on the back of the head (and into Voldemort's face) is omitted.
* Draco Malfoy insulting Ron's family, his poverty and Hagrid's hut in front of him is omitted.
* In the book, Harry receives a wooden flute from Hagrid, a fifty pence piece from his Uncle Vernon and Aunt Petunia, a jumper from Molly Weasley, a large pack of cauldron cakes from Flick, a large pack of Chocolate Frogs from Hermione and the Invisibility Cloak from Dumbledore. In the film, Harry only receives the Cloak, but the jumper appears in a deleted scene.
* In the book, after Harry tries on the Invisibility Cloak, he reads the message that came with the package, but in the film, Harry reads the message before trying the cloak on.
* Also, in the film, the last line of the Christmas note ("A Very Merry Christmas to you") is omitted.
* In the book, Harry sees his parents and his grandparents in the Mirror of Erised, but this was changed in the film to where Harry just sees his parents. However, the scene where Harry sits in front of the mirror when Dumbledore catches him implies that he also sees his grandparents as the camera only shows the rear part of the mirror's frame.
* Harry sees the Mirror of Erised thrice on Christmas instead of three days like in the book. But the part where Harry didn't feel like having fun appeared in a deleted scene.

### 13. Nicolas Flamel

* The Hufflepuff-Gryffindor Quidditch match, where Snape is the referee, is omitted in the film. This is where after the victory against Hufflepuff, Harry sees a hooded figure rush off into the forest as he is about to put away his Nimbus 2000 in the broomshed and hops back on his broom to follow them into the forest, encountering Snape and Quirrell and overhearing their conversation. Instead in the film, Harry hears Snape talking to Quirrell in a corridor near the library before stumbling upon the Mirror of Erised.
	+ Also due to this change, in the film Filch interrupts Snape and Quirrell's conversation by stating there was a student out of bed due to having Harry's lamp. In the book however after Harry dropped the lamp while in the library's Restricted Section, Filch went to get Snape just as Harry is sneaking into the room where the Mirror of Erised is stored to hide.
* Since the Quidditch match was omitted, the part of Ron and Neville getting into a fistfight with Draco, Crabbe and Goyle in the stands during the game is also omitted.
* In the film, Harry, Ron, Flick and Hermione discover the link to Nicolas Flamel and the stone through a book, rather than Albus Dumbledore's Chocolate Frog Card, although a deleted scene shows them discovering the connection through a chocolate frog card, but it was switched when edited.
* In the book, Nicolas Flamel's name is spelled Nicolas. In the film, an "H" is added spelling it "Nicholas Flamel."
* In the film, when Harry, Ron, Flick and Hermione are reading the information about the Philosopher's Stone, Nicolas' wife Perenelle is not mentioned and another fact that isn't mentioned is about Nicolas and Perenelle enjoying a quiet life in Devon.

### 14. Norbert the Norwegian Ridgeback

* The part where the dragon Norbert is sent to Charlie Weasley is omitted. Instead, Hagrid later revealed to the Quartet that Dumbledore sent him to Romania (whether to Charlie or not is not revealed, although it is mentioned in the film that Charlie works with dragons in Romania).
* In the book, when Harry, Flick and Hermione get detention, it is because they left the invisibility cloak in the Astronomy Tower while sending Norbert to Charlie and were caught by Filch at the foot of the stairs. In the film, they get detention because Draco Malfoy saw them in Hagrid's hut past midnight (which is similar in the book, except that Draco did not inform McGonagall).
* In the book, Neville was also given detention for being out of bed because he was trying to warn Harry about Malfoy and was caught by Professor McGonagall.
* Ron is also with them in the film, while in the book he was recovering in the hospital wing after being bitten by Norbert. Therefore, in the film, Ron gets detention instead of Neville.

### 15. The Forbidden Forest

* In the film, McGonagall takes 50 points from Slytherin instead of 20. She says "'*50 points will be taken. Each.*" before saying "*All five of you will receive detention.*" Until she says that, Malfoy did not know that he would also be getting detention.
* In the book, Malfoy is caught by McGonagall before Filch catches Harry, Neville, Flick and Hermione. In the film, Harry, Ron, Flick and Hermione are caught by McGonagall after coming back from visiting Hagrid while Malfoy is already caught by McGonagall.
* In the book version, it is mentioned that the other Gryffindors and Hufflepuffs/Ravenclaws were very upset with the Quartet having lost a lot of points. This is not shown in the film (excluding Gryffindor's initial disappointment in having lost the House Cup at the end).
* Other than Ron serving detention in Neville's place for the film Harry is paired with Flick, Draco and Fang initially when the gang divides into two groups at the start of detention. In the book Harry is initially paired with Hagrid and Hermione when the group divides up, but after Draco pulls a nasty trick on Neville, Hagrid is forced to swap Harry and Neville between each group.
* Ronan and Bane are omitted from the film and Firenze is the only centaur who appears. Bane later appears in the *Order of the Phoenix* film, while this would be Firenze's only appearance in the films.
* In the book, Harry and Flick get a ride on Firenze's back and he escorts them back to Hagrid, Draco, Fang, Hermione and Neville. In the film, the ride is omitted and Draco and Fang return to the scene of the crime with Hagrid, Ron and Hermione to find Harry, Flick, Firenze and the dead unicorn.
* In the scene after the Forbidden Forest, Hermione says Voldemort's name. In the book, she refers to him as "You-Know-Who." This also creates a continuity error where she says Voldemort's name in the fifth film as if she has never said it before.

### 16. Through the Trapdoor

* In the book, when the quartet tell McGonagall they have to see Dumbledore, Harry almost says that Snape is going to try and steal the Stone, but then corrects himself and says someone, but in the film, Harry just says that someone is going to try and steal it.
* Due to Peeves' omission from the film, the scene where Harry manages to drive him away by impersonating the Bloody Baron while under the Invisibility Cloak with Ron, Flick and Hermione is omitted.
* Harry, Ron, Flick and Hermione never have the flute that would put Fluffy to sleep, as they do in the book. Instead the quartet enter the room under the Invisibility Cloak, spotting that there is a self-playing harp enchanted by Quirrell. Fluffy is asleep until the spell wears off. Also in the novel, the quartet find a harp under Fluffy's paw, but in the film the harp is standing up, playing, at a distance away from Fluffy instead of being under its paw.
* In the film, when the quartet fall into the Devil's Snare, Hermione, Flick and Harry escape by relaxing, and Hermione saves Ron with *Lumos Solem*. In the novel, Hermione and Flick were able to find a damp wall and free themselves before the plant had a firm grip on them. Hermione also frees both Harry and Ron with Bluebell Flames.
* Likewise, in the novel it is Hermione who panics during the incident with the Devil's Snare and Ron who has to snap her out of it. In the film, this is reversed - Ron panics and Hermione calms Ron down.
* In the book, Harry, Ron, Flick and Hermione each seize a broomstick and kick off into the air to chase the Winged Keys, while in the film, only Harry does, as there is only one broom. This could be a deliberate choice by the filmmakers to clearly show each of their skills (Hermione with knowledge, Harry being a Seeker, Ron with Chess, and Flick with duelling).
* In the book, the chess game depicts the pieces simply knocking each other out and dragging captured pieces off the edge of the board. In the film, the chess game was depicted with the pieces destroying each other (presumably to be fixed with Reparo at the end of the game).
* In the book, Harry, Ron, Flick and Hermione take the places of three chessmen. This is also similar in the film, except that Ron is seen to ride the knight.
* On the way to the Philosopher's Stone, each obstacle was created by a teacher. While probably the same case in the film, this wasn't directly acknowledge; in the film, Snape's Potion Riddle is omitted. Because of this omission, Hermione stays with Ron after Ron was injured in the chess match at McGonagall's room instead of travelling on with Harry and Flick, and when Flick is injured after fighting the troll she goes back while Harry moves on.

### 17. The Man With Two Faces

* In the book, Quirrell was aware that Hermione was the one who set Snape's robes on fire since he mentioned she had knocked him over during the Gryffindor-Slytherin Quidditch match, but in the film, he doesn't appear to know as she was under the stands and another wizard had instead knocked Quirrell over.
* Quirrell does not mention Snape being at Hogwarts with Harry's father as students who loathed each other.
* In the book, Quirrell turns around so that Voldemort is facing Harry. In the film, however, Quirrell does not turn around, and Harry sees Voldemort's reflection in the Mirror of Erised instead.
* In the book, Quirrell snaps his fingers which causes ropes to appear out of thin air and wrap themselves around Harry. This is omitted from the film, and when Harry tries to escape Quirrell/Voldemort with the Stone in his pocket by running back up the stairs the way he came, Voldemort shouts "Stop him!" and Quirrell snaps his fingers which causes fire to appear all around the room so Harry can not escape.
* In the film, Harry's parents appear in the Mirror of Erised and Voldemort says he and Harry can bring them back if he gives Voldemort the Stone in return. This did not happen in the book, but instead Voldemort tells Harry that his mother needn't have died because she was trying to protect him and says that Harry should give him the Stone unless he would have wanted Lily to have died in vain.
	+ In the same scene, Voldemort directly tells Harry his philosophy on how it is only power and those too weak to seek it that truly exist, and not the concept of good and evil. This does not happen in the book, although Quirrell does relay this statement to Harry when explaining how he came to meet Voldemort.
* In the book, Voldemort kills Quirrell by leaving his head, causing him to die. In the film, Harry kills Quirrell by grabbing his face, causing him to turn to dust.
* In the book, when Harry touched Quirrell, Quirrell's skin blistered wherever Harry touched. In the film, when Harry touched his hand, Quirrell's hand turned to stone and crumbled. Also, when Harry grabbed his face, it made his whole body demolish and Voldemort escaped. This is what knocked Harry out.
* Poppy Pomfrey is omitted but there is an unknown nurse who appeared before Albus Dumbledore took a bite of Bertie Bott's Every Flavour Beans. The unknown nurse could be Poppy Pomfrey being played by an uncredited actress in a non-speaking part.
* Once again, Nicolas Flamel's wife Perenelle is not mentioned when Harry asked about Flamel dying.
* In the book, Harry reunites with Ron, Flick and Hermione in the hospital wing when they come to visit him, while in the film, he reunites with them when he finds them standing at the top of a staircase.
* In the book, Hagrid gives Harry a photo album of his family at the hospital while in the film version, he gives it to him at the end of term when about to board the Hogwarts Express.
* The moment when Flick sees her mother in Harry's photo album and realises that they are related is omitted. This causes a continuity error in *Goblet of Fire* when Flick is taken as Harry's hostage for being related to him but their family relation is never mentioned in the films.
* In the novel an epilogue shows Harry and his friends return to their families who are waiting for them including the Dursleys. In the film it is omitted.

## Chamber of Secrets

### 1. The Worst Birthday

* The book begins in the morning of Harry's birthday. The film begins in the evening of the day the Masons' visit, omitting Dobby in the hedges and additional quarrels between Harry and the Dursleys. However Vernon does say that Harry is not thankful; Vernon says they cared for Harry since he was a baby, gave him their good food, and gave him Dudley's extra bedroom because they were so merciful.
	+ On a related note, the film implies that the Dursleys' gave Harry Dudley's old bedroom after his first year of Hogwarts, when he actually was given the bedroom right before Harry's new school year in the previous book, in an attempt to dissuade the acceptance letters to Hogwarts addressed to Harry.
* The Dursleys preparing and practicing for the Masons' visit all day is omitted, so instead they only practice in the evening before they come.
* The scene where Harry is banned by the Dursleys from saying the word "magic" is not in the film.

### 2. Dobby's Warning

* In the book, when Harry enters his room, Dobby sits on his bed quietly. In the film Dobby is jumping on his bed and laughing.
* Exactly when Dobby's banging on the wall caused Vernon to investigate and tell off Harry for ruining his "Japanese golfer joke" varies; in the book, the noise ruined Vernon's delivery of the punchline, while in the film, he was half-way through the joke.
* Dobby does not mention that Voldemort, or a possible brother, could be a suspect, as in the book version.
* In the books, whenever Dobby disapparates, the usual loud crack is heard. But in the films, Dobby appears and disappears quietly, however it differs from film to film how he does it. In this film he fades, like if the wind took him.
* The film shows Dobby levitating the cake into the sitting room and dropping it on top of Mrs Mason. In the book, however, the pudding dropped by Dobby in the kitchen, causing it to explode all over Harry, not Mrs Mason. Also in the film, Mr Mason tastes the cake, using a finger.
* While the reason in the film for the Masons' departure was due to the cake dropping on Mrs Mason, in the book it was due to Mrs Mason's fear of birds when an owl sent by the Ministry of Magic arrived at the Dursleys in regards to the illegal use of the Hover Charm that was performed.
* A scene is cut where the Ministry sends a letter to reprimand Harry for violating the Decree for the Reasonable Restriction of Underage Sorcery, which informed the Dursleys of this rule. This explains in the following film how Vernon Dursley already knew that Harry is not allowed to perform magic outside of school. Since this scene was not included in this film, it caused a continuity error with the future films.
* In the book, Uncle Vernon tells a man to fit the bars on Harry's window, but in the film, Uncle Vernon fits the bars himself.
* Harry's nightmare of himself being in a zoo cage is omitted.

### 3. The Burrow

* In the film, Ron wishes Harry a happy birthday when they fly away from 4 Privet Drive, as the Weasleys get Harry out the same evening. Ron doesn't say this in the book as Harry's birthday was the same day as the Masons visit.
* In the book, the Dursleys were woken up by Hedwig's screech. In the film, they're woken up by the noise of the bars falling into the grass.
* In the book, Harry's trunk is locked in the cupboard under the stairs and Fred and George sneak in the house and pick the lock of both Harry's room and the cupboard. In the film, Harry's trunk is in his room and Fred and George don't sneak in the house.
* In the book, Harry nearly forgets Hedwig, but he gets to her just in time. In the film, Harry doesn't forget anything.
* When Ron, Fred, and George arrive to rescue Harry, in the book they tie a rope to the bars. In the film, Ron places a large hook on a rope on the bars.
* When Harry was escaping from the Dursleys, the book states that all of the Dursleys tried to prevent him from escaping, only to end up hanging from the window. The film depicts only Uncle Vernon trying to prevent him from escaping, which results in him falling out of the window and landing into a bush. The fall of Vernon from the window was a comic effect created to make the scene more comedic.
* In the book the Weasley brothers suggest that Dobby could be an untrustworthy servant of the Malfoy. This is omitted from the film.
* In the book, when Harry arrives at the Weasleys' home, Mrs Weasley makes her sons "de-gnome" the garden. This scene is omitted from the film.

### 4. Flourish and Blotts

* The exact nature of the Floo Powder mix-up Harry underwent that sent him to Knockturn Alley varied: in the book, Harry ends up botching the pronunciation of "Diagon Alley" due to saying it amongst coughing fits due to the Floo Powder getting caught in his respiratory system. In the film, he mispronounces "Diagon Alley" as "diagonally" out of a panic thanks to watching the effect of the Floo Powder as a demonstration. On a similar note, the film doesn't require a lit fireplace to use floo powder, while the book does.
* The scene where Harry listens to Lucius and Draco Malfoy's business with Borgin is cut. It is included in the deleted scenes section of the DVD. (An alternate version of the same scene, where Harry is caught by Borgin was also filmed and included on the DVD). In this scene Lucius almost hits Draco two times with his walking stick when telling him not to touch anything. This *could* be meant in reference to the cursed necklace.
* In the book, Mr Weasley repairs Harry's glasses in Diagon Alley, but in the film, Hermione repairs them and the knowledge of her using underage magic is unnoticed. Though it is revealed in one of the following books that the Ministry of Magic only knows *where* magic is used and not *who* it is that it using magic. (This explains why Harry is believed to be the one to perform the levitating spell on the pudding through it is Dobby).
* The part where Arthur Weasley fights with Lucius Malfoy in Flourish and Blotts is omitted. Instead, they only exchange tense words. Lucius also mentions that he will "see you [Arthur] at work," implying that he works at the Ministry of Magic, or at the very least has visited the Ministry enough times that he and Arthur have interacted to some extent there. On a related note, Lucius only subtly puts the diary into Ginny's cauldron after looking at and mocking her hand-me-down textbook in the film. In the original, he gives the book back to her after fighting her father, the diary stealthily included in it, after the fight.
* When they meet in Diagon Alley, Hermione chides Lucius Malfoy for not using Voldemort's name. (In the first two films, Hermione shows no fear of the name Voldemort, speaking with without difficulty in the first film). In the books, Hermione never uses the name Voldemort until the fifth novel, and even then it requires courage. The films have a bit of a continuity issue on this point as the fifth film shows her getting the courage to say "Voldemort."
* Arthur Weasley asks Harry about escalators in the book, but in the film he asks about rubber ducks and plug holes.

### 5. The Whomping Willow

* Harry and Ron get to Hogwarts with almost no problem in the book, whereas in the film they nearly get hit by the Hogwarts Express, and Harry nearly falls out of the car.
* In the film, Argus Filch finds Harry and Ron and takes them to Professor Snape's office, but in the book, Snape himself finds Harry and Ron and takes them to his office (with Harry and Ron noticing his absence from the Great Hall professors' table just prior to Snape revealing himself to them).
	+ In a deleted scene that follows this scene Harry finds a letter about a Kwikspell course addressed to Filch and hands it over. In the book Flick is with him and they find the letter in Filch's office.
* In the book, Ron and Harry eat sandwiches in Snape's office after being caught by Snape. Ron wants to know which house Ginny was placed in and Professor McGonagall tells him she's a Gryffindor. This scene is not in the film, but Ron does find out about Ginny being in Gryffindor from his mother's howler.

### 6. Gilderoy Lockhart

* In the book, Mrs Weasley's Howler to Ron is much lengthier and mentions Harry in it. In the film the Howler message is much shorter and Harry is never mentioned, instead a part of the Howler was directed to Ginny. Also in the book, there is no mention of Howlers folding themselves into a pair of lips.
* The Howler bursts into flames in the book but rips itself into shreds in the film.
* Lockhart's scene with Professor Sprout before the first Herbology lesson of the year, in which he implied that he knew more about caring for Whomping Willows than she did, is not shown.
* The scenes in which Lockhart lectures Harry for giving out autographs (due to Colin's actual request in the book) and makes him late for Herbology, are not seen in the film.
* In the film, Neville Longbottom faints when the Mandrakes are shrieking, and Professor Sprout remarks that he has been "neglecting his earmuffs." This scene does not happen in the book.
* Defence Against the Dark Arts shows both Hufflepuffs and Slytherins in the same class as the Gryffindors.
* Second-year Gryffindors have Herbology only with the Hufflepuffs in the book, but also with the Slytherins in the film.
* When the Pixies are loose in Lockhart's class, there are several differences that occur:
	+ In the novel, several pixies shoot straight through the window, showering the back row with broken glass. The rest proceed to wreck the classroom more effectively than a rampaging rhino, grabbing ink bottles and spraying the class with them, shredding books, tearing pictures from the walls, upending the bin, grabbing bags and books and throwing them out of the smashed window: within minutes, half the class were sheltering under their desks and Neville was swinging from the iron chandelier, before the bell rings and everyone leaves. In the film, the chaos consists of book throwing, tearing pages out of books and hanging Neville onto the chandelier. Also in the film, no one hides under the desks and everyone leaves on their own accord to save themselves from the Pixies.
	+ The Pixies throw Lockhart's window in the book. In the film, this does not happen and instead, one of the Pixies snatches Lockhart's wand and breaks off the dragon skeleton hanging from the ceiling.
	+ Also in the film there is an added moment when the Pixies steal a portrait of Lockhart and he tries to get it back, but fails.
	+ In the novel, Lockhart hides under the desk, but in the film, he doesn't. Also Neville falls from the chandelier in the book and misses Lockhart. In the film, Neville remains hanging from the chandelier, with him humorously lamenting why these situations always happen to him.
	+ In the novel, Harry, Ron, Flick, and Hermione are almost at the door but Lockhart stops them and asks them to try and nip the rest of them back into their cage, but in the film, the quartet just remain a distance from the door and try to stop them until Hermione immobilises all the Pixies.
	+ In the film, Lockhart runs into his office, while in the book, he ran through a door, but it is not specified which door it is.
	+ In the novel Hermione freezes several pixies and then sends them back to their cage. In the film, she paralyses all the Pixies and is never shown putting them back into their cages.
* Ernie Macmillan's role is diminished to a non-speaking part. The part where he and Hannah Abbott talk in the library about their theory of Harry wanting to attack Justin Finch-Fletchley was cut, but appears on the deleted scenes, however in the Study Hall. Also, Ernie is the one who blames Harry for attacking Justin when he is discovered, petrified, but in the film, Argus Filch finds Harry and wants to expel him. In the book, it was Peeves who found him, and sung his funny song.
* As with the previous film and all of the following ones, the character of Peeves is omitted completely.
* During the first Defence Against the Dark Arts lesson, Lockhart refers to the Bandon Banshee as male rather than female.
* The scene where Lockhart gives out a test is omitted in the film. It is included as a deleted scene on the DVD of the film.

### 7. Mudbloods and Murmurs

* In the book, Hermione has never heard the term "Mudblood" before, and Ron and Flick explain the term to her and Harry. In the film, she is aware of the term and is deeply hurt, even seen trying not to cry, and explains what it means to Harry, though Hagrid defines its origin for Harry and says exactly what Ron and Flick say in the book. Flick only responds to it with only two words, and Ron is unable to say anything as he is in the middle of throwing up slugs.

### 8. The Deathday Party

* Nearly-Headless Nick's Deathday Party does not appear in the film, other than in concept art. Because of this, Harry encounters the petrified Mrs Norris on his way back from spending hours of detention with Gilderoy Lockhart instead. Harry also meets Ron, Flick and Hermione just before finding Mrs Norris in the film, while in the book they were with Harry the entire time.

### 9. The Writing on the Wall

* In the book, Harry, Ron, Flick and Hermione are interrogated by the teachers in Lockhart's office. The film moves the interrogation to the corridor where the attack happened.
* Mention of Filch being a Squib is omitted.
* Mention of Ron's detention and the fact that he recognised Tom Riddle's name from an award he received for special services to the school was cut, but appears on the deleted scenes.
* In the film, Hermione claims that the message on the wall is written in blood. The book, however, states that the message is simply written in red paint.
* In the film, it is Professor McGonagall who tells the class about the history of the Chamber of Secrets instead of Professor Binns.
* Because of the scene with Harry first hearing the Basilisk being moved to during his detention with Lockhart instead of while heading back from the Deathday Party, the teacher's interrogation of the quartet was altered:
	+ Snape is not supporting Filch's claims just like in the book where he does in order to punish Harry. The film depicts him announcing to the teachers that the quartet were simply present at the wrong place at the wrong time, implying that he may have been vouching for Harry's innocence.
	+ Snape also views Harry in particular as a suspect due to the latter's absence during dinner before Lockhart admits causing Harry's absence; unintentionally having Harry stay beyond the intended time period for detention. Flick explains to the teachers that her, Hermione and Ron's absence after they noticed that Harry was missing and they tried to search for him. Harry was about to mention about hearing the basilisk's voice before trailing off, but then feigns of replying that he wasn't hungry and adds that they found Mrs Norris while on the way to the common room.
* In the book, Flick is adamant that Malfoy is not the Heir of Slytherin, whereas in the film she agrees with the others that it could be him.

### 10. The Rogue Bludger

* In the book, to borrow the Moste Potente Potions book from the library, which had the recipe for Polyjuice Potion, Hermione had to get a note from Lockhart (which he signed without looking at) because it was in the restricted section. In the film, the scene was omitted, and the book was in the regular section of the library.
* In the film, the match takes place in sunlight; in the book, the majority of it takes place in rainy weather.
* In the book, Draco does not notice the Snitch at all, due to having been insulting Harry at the time and Harry quickly catches the Snitch before Malfoy could realise it, but in the film, he sees it just after Harry does, and just after ducking to prevent being hit by a Bludger, and it leads to both of them chasing after the snitch for a few seconds before Harry catches it first. Also in the film, they chase the Snitch in between the Quidditch Stands.
* During the match in both book and film, Slytherin had taken the lead of Gryffindor of throwing the Quaffle through the hoops, but they had different scores; in the book, the final score was 60-0, but in the film, the score is 90-30, in which Gryffindor would then receive 150 points because Gryffindor won the match.
* In the film, while Malfoy was dodging the Bludger, he tilted his broom too low, the tip of his broom hits a beam, causing him to catapult off his broom, and land on the grass, doing a full split. He was still moaning in agonising pain at the Hospital Wing when Madam Pomfrey tells him not to make such a fuss.
* In a deleted scene from the film Harry tries to avoid being hit by a Bludger by flying in the Slytherin tribune. This does not happen in the book.
* Lucius Malfoy is seen in the audience observing the Gryffindor-Slytherin match in the film. This is not mentioned in the book.
* In the book Fred and George attempt to protect Harry from the rogue Bludger, and later place it back in its case while restraining it. In the film, Hermione destroys the rogue Bludger with Finite Incantatem after the game, effectively damaging a piece of Hogwarts property.
* In the book, Harry's arm is injured by the Rogue Bludger, before he charges at Malfoy, but after spotting the Snitch, due to a moment of hesitation. In the film it occurs after the added incident in which Malfoy has crashed off his broom. Additionally Hagrid is present when Lockhart removes the bones from Harry's injured arm when attempting to heal the broken bones, whereas he wasn't in the book.
* In the film, Filch supports Slytherin, being seen standing in a crowd of Slytherin spectators just like in the first film, whereas in the books is is never specified if he takes sides.
* In the book, when Harry is in the hospital wing following the Quidditch match, Ron, Flick, Hermione and Madam Pomfrey are the only people there when he takes the Slele-Gro, the rest of the team come in later and Madam Pomfrey shouts at them to leave. In the film the entire team plus Ron and Hermione come with him, and Madam Pomfrey tells them to clear her way.

### 11. The Duelling Club

* The scene in which Harry, Ron, Flick and Hermione cause a disturbance in Potions to steal ingredients from Snape was omitted. This caused a continuity error for the *Harry Potter and the Goblet of Fire* where Snape accuses Harry of brewing Polyjuice Potion by stealing its ingredients "again." Possible explanations could be that it happened off-screen, or that Snape just came to the conclusion that Harry did it. Also, because Barty Crouch Jr. was stealing Snape's ingredients to brew Polyjuice Potion to impersonate Alastor Moody in the fourth film, it is possible that Snape mistakenly thought Harry was stealing the ingredients earlier in his fourth year and was warning him not to do so in what Snape falsely perceived to be a second time.
* In the Duelling Club scene, Harry and Draco are the only combatants participating, while in the novel, other classmates in their year are shown participating along with them, such as Hermione, Millicent Bulstrode, Flick, Pansy Parkinson, Ron, Seamus, Neville, and Justin Finch-Fletchley.
* Also in the Duelling Club sequence, when Harry speaks Parseltongue, in the book, the reader knows what he says immediately, as is the case when Harry speaks with the snake at the zoo in the film version of *Philosopher's Stone*. In the film, it's only hissing sounds until Harry explains what he said to Ron, Flick and Hermione. Other uses of the language later in the film are left untranslated, but most likely are the same as the book's translations.
* A line that Snape spoke in the book "Longbottom causes devastation with the simplest spells," was changed to "Weasley's wand causes devastation with the simplest spells" after Lockhart chose Ron and Harry to demonstrate the Disarming Charm (in the book, Snape spoke instead about Neville Longbottom). The film also changed the line "We'll be sending what's left of Finch-Fletchley up to the hospital wing in a matchbox" to "We'll be sending what's left of Potter up to the hospital wing in a matchbox" as Justin Finch-Fletchley did not duel during the scene, either.
* Also in the Duelling Club scene, Rictusempra was used like a Stunning Spell which caused Malfoy to be thrown up in a back flip. In the book, Rictusempra was described to give its receiver an uncontrollable tickling sensation. Tarantallegra, a jinx used to force someone to dance wildly and involuntarily, was also not used in the film. In addition, attacking with a Serpensortia spell was Malfoy's own choice, whereas in the novel, Snape was the one who gave him the idea. Everte Statum was also not mentioned in the book but was used in the film.
* In the film, Moaning Myrtle appears while Harry, Ron, Flick and Hermione are brewing the Polyjuice Potion. In the book she appears much earlier, at Nearly-Headless Nick's Deathday Party.
* In a deleted scene after the Duelling Club, Harry was talking to Hedwig in a mountainous area away from the castle saying "Who am I, Hedwig? What am ?"

### 12. The Polyjuice Potion

* In the book, when Harry asks the Sorting Hat whether it put him in the right house, he does it with the hat on his head. In the film, he merely stands before it.
* The Polyjuice Potion in the book changes colours as the hair is added. In the film, it does not change colour at all.
* The scene in the Great Hall during the Christmas Feast, Flick and Hermione simply say that they got Pansy Parkinson's and Millicent Bulstrode's hairs off their robes. The novel, however, depicts them a finding the hairs while during Duelling Club while they were fighting.
* The scene where Harry and Ron hide Crabbe and Goyle in a broom cupboard is omitted (the scene was filmed and included in the deleted scenes section, though). Due to this omission Crabbe and Goyle are dazed and confused when Harry, Ron and Flick run past them after their transformation has worn off instead of pounding while still in the cupboard.
* In the novel, the potion is in one of the stalls and when the quartet prepares to drink from their separate glasses, they each go into a different stall and drink. In the film, the potion is in one of the sinks and the quartet drink beside that same sink and only Ron, Flick and Hermione run into cubicles when they feel they're going to be sick (not said in the book) while Harry remains at the sink and watches himself transform.
* In the book, Harry feels his insides start writhing as though he'd just swallowed live snakes - doubled up, then a burning sensation spreads rapidly from his stomach to the very ends of his fingers and toes - next, bringing him gasping to all fours, then comes a horrible melting feeling, as the skin all over his body bubbles like hot wax - and before his eyes, his hands began to grow, the fingers thickened, the nails broadened, the knuckles were bulging like bolts - his shoulders stretched painfully and a prickling on his forehead told him that hair was creeping down toward his eyebrows - his robes ripped as his chest expanded like a barrel bursting its hoops - his feet were agony in shoes four sizes too small. In the film, Harry watches his hands bubbling and then looks into the sink's mirror and watches his face bubbling then turning into Goyle's face.
* The effects of the Polyjuice Potion differ from book to film. In the film, Harry, Ron and Flick's voices don't change when they become Crabbe, Goyle and Parkinson, forcing them to imitate their voices. This was presumably done to avoid confusing the audience because of the change in appearance which would be the standard for the use of the potion in both of the Deathly Hollows films.
	+ This causes a continuity error with Barty Crouch Jr.'s usage of the Polyjuice Potion in *Harry Potter and the Goblet of Fire* as his voice does change when he becomes Moody, though this can be considered as an exception as his identity was kept secret until the end of the film.
* In the book, Harry's vision changes and he takes his glasses off after using the Polyjuice Potion, but in the film, his vision apparently does not change, and only takes the glasses off when Draco questions Harry (here disguised as Goyle) wearing them.
	+ This could also create a continuity error in the film adaptation of first half of *Harry Potter and the Deathly Hallows* when Hermione, Flick, Ron, and others take the potion to transform into Harry, and Hermione remarks that Harry's eyesight is really bad.
* During the Slytherin Common Room scene, there are some parts of the book which are omitted from the film, like:
	+ Draco showing Goyle/Harry, Crabbe/Ron, Parkinson/Flick the *Daily Prophet* article about Arthur Weasley's inquiry at the Ministry of Magic about having been fined for having an enchanted Muggle car is omitted.
	+ Draco does not mention Dumbledore's love of Muggleborns (but it's obvious that Dumbledore still loved them). Also, due to this omission, Draco does not make the rude mimicking act of Colin Creevey wanting Harry's autograph.
	+ There is no mention of Azkaban in this scene because Harry did not ask Draco whether he knew if the person who opened the Chamber last time was caught. Instead, it is first mentioned by Hagrid in the scene where Dumbledore and Cornelius Fudge come to Hagrid's hut.
* In the film, when Draco mentions that "you'd never know" the Weasleys were Purebloods the way they behave along with an added line that was not mentioned in the book - "They're an embarrassment to the wizarding world. *All* of them." - Ron makes a fist and looks furious, but in the book, Ron's face is just contorted with fury and there is no fist.
* In the book, Flick, Ron and Harry realise they're turning back to normal when Harry sees Ron's hair turning red and his nose lengthening and they run. In the film, they realise when Flick sees Harry's scar reappearing (which didn't happen in the book), Harry sees Ron's hair growing red again, and Ron sees Flick's eyes turning blue and whispering "Scar" (Flick), "Hair" (Harry), and "Eyes" (Ron).
* There is a scene added in which Draco finds a small package and after shaking it once, asks Goyle/Harry if it's his. Harry shakes his head and Draco puts the package in his pocket, then a few seconds before Harry, Ron and Flick realise they're about to turn back to their normal selves, Draco unwraps the package and after the trio start turning back to normal, Draco is seen to have a small silver object in his hand, but it does not fully appear since it was in Draco's hand. The package was not included in the book.

### 13. The Very Secret Diary

* The part where Hermione gets a get well soon card from Lockhart is omitted, but included in the original script.
* In the book, Professor Binns explains to the class about the Chamber of Secrets during a History of Magic class. The film makes a different depiction and has Minerva McGonagall explain it during a Transfiguration class. Professor Binns is omitted in the film.
* The Valentine's Day breakfast in the Great Hall which was arranged by Lockhart is omitted.
* The scene where Harry gets his Valentine and Malfoy tries to steal Riddle's diary in which Harry disarms him and Percy scolds Harry for using magic in the corridors is omitted.
* In the book, the ink is scarlet. In the film, the ink is black.
* In the book, Tom Riddle's diary displays his first and middle names as initials. In the film, Tom Riddle's full first and last names are shown on the diary.
* In the book, when Harry gets sucked into the diary to 1943, he enters through the Headmaster's Office where Professor Dippet was reading a letter from Tom Riddle. In the film, he enters below the Grand Staircase where Tom Riddle was standing, shortly before a younger Dumbledore appears to talk to him.
* In the film, a scene is added in which Harry and Tom Riddle see Myrtle's dead body (unknown to Harry) wrapped up in a sheet with her right arm sticking out and being carried away by several unidentified wizards. This event did not occur in the novel.
* In the book, Armando Dippet is the one to talk to Tom Riddle about Hogwarts closing. In the film, Dumbledore talks to Rom while Dippet appears only a brief second then turns his back and does not speak to Tom. Although, in the book, after Tom's meeting with Dippet, he finds Dumbledore who asks Tom why he's wandering around late and then tells him to hurry off to bed because it's not safe to roam the corridors these days.
* In the book, while Harry is in the memory inside the diary and he sees Tom Riddle with Rubeus Hagrid, Tom calls him "Rubeus," but in the film he calls him Hagrid instead, like everybody else.
* The dwelling of Aragog is a treasure chest-like box as opposed to a cupboard.

### 14. Cornelius Fudge

* In the book when McGonagall is cancelling the Gryffindor-Hufflepuff Quidditch Match, she is doing this with a large megaphone while out on the field to send the message much to the dismay of Oliver Wood and the audience. In the film however, she simply informs the Gryffindor team just as they were heading out to the field, and Wood is much less aggressive about it than in the book.
* Ginny's attempt to confide her secret to Ron, Harry and Flick is omitted, although a scene where Ginny sees Harry with the diary was initially featured in the script.
* Almost all foreshadowing hints about Ginny acting strangely or emotionally are omitted. However, in the film, the scene in which McGonagall informs the Gryffindors of the possible closing of the school reveals a close-up of Ginny appearing uneasy as if it's her fault.
* Penelope Clearwater's role as a Basilisk victim is omitted from the film.
* The book mentioned that "*the crowing of the rooster is fatal to the Basilisk*" which led Hagrid's roosters to be killed since the Heir of Slytherin didn't want one near the castle. This was not mentioned in the film, although Hagrid was seen holding one of his dead roosters when bursting into Dumbledore's office in an attempt to defend Harry from being expelled before realising Dumbledore doesn't even think Harry's at fault for what had happened with Mrs Norris, Colin Creevey, Justin Finch-Fletchely, and Nearly-Headless Nick. A deleted scene shows Harry finding Hagrid holding the rooster. Hagrid explains his thought about a Blood-Sucking Bugbear, and that he is going to ask Dumbledore for permission to cast a protection charm.

### 15. Aragog

* In the book, after Hagrid mentions that if they were looking for answers, all they'd have to do was follow the spiders, Harry, Ron and Flick didn't see any spiders until one day in Herbology when Harry points them out. They noticed the path the spiders were taking, which was right into the Forbidden Forest, and didn't follow them until everyone had gone to sleep in their dormitory. In the film, right after Hagrid is taken away by the Ministry, the trio see spiders crawling along Hagrid's window and follow them into the Forest.
* In the book, Ron (reluctantly), Flick and Harry looked around for spiders and then when entering the forest, Ron is brave. In the film, Ron is completely scared and reluctant to go into the forest and follow spiders.
* In the film, Ron asks why they have to follow spiders and why it could not be "Follow the butterflies." This dialogue did not appear in the book.
* In the book, Harry, Ron, Flick and Fang are taken by the spiders to Aragog's lair but in the film they make their own way there. Also, they never see the Ford Anglia before arriving at Aragog's lair; hence their looks of surprise in the film when it crashes through the spiders to rescue them, although a deleted scene shows them finding the car before they meet Aragog.
* Also, in the deleted scene where the trio find the Ford Anglia, Harry tells the others they don't want to lose the trail of spiders, but in the book, they lose the trail and try to find them before being dragged to Aragog's lair.
* In the film, Mosag, Aragog's mate, is not mentioned.

### 16. The Chamber of Secrets

* In the book, Harry deduces and tells Ron and Flick that the girl who died in the fifth-floor bathroom was most likely Moaning Myrtle due to her "never leaving" there, before Flick finds the scrap of paper in the petrified Hermione's hand detailing the Basilisk as well as her personal note as to how it was travelling through the school, immediately after returning from the Forbidden Forest. In the film, Harry tells Ron and Flick this after finding the paper himself, just before McGonagall announces for all the students to return to their dormitories immediately.
* In the book, when McGonagall and the other teachers volunteer Lockhart to fight the Basilisk, the teachers are collected in the Staff Room with Harry, Ron and Flick hiding in the wardrobe. In the film, the teachers are gathered in front of the daubed message on the wall stating Ginny's capture with the trio hiding behind a corner. Also, in the book the teachers' comments after Lockhart has left them make it clear that they know he is incapable and were simply getting him out of the way. These comments are left out from the film, but it's still highly unlikely the plan was ever genuine.
* In the book, when the trio realise that Lockhart is a fraud, they subdue him by performing a Disarming Charm and throwing his wand out of the window. In the film, Lockhart drops his wand in a manner of defeat, when Harry, Ron and Flick point theirs at his face.
	+ Also, the book has Lockhart citing some specific examples of individuals that he not only stole credit for their deeds from, but also wiped memories from as insurance. The film does not actually list any specific examples of his victims.
* In the film, just before Harry, Ron and Flick jump into the giant pipe leading to the Chamber of Secrets upon opening it, Moaning Myrtle offers to let Harry share the toilet she lives in should he die in the chamber. She only alludes to this offer in the book *after* Harry, Ron, Flick, Ginny, and a recently-amnesiac Lockhart leave the chamber, where se expressed some implied disappointment in the fact that Harry survived.
* In the book, it says that the snake who had shed the skin must have been at least twenty feet long. In the film, Ron remarks that the creature must have been at least sixty feet long.
* In the book, Harry walks for a longer period through the tunnel to find the Chamber after being separated from Ron, Flick, and Lockhart, but in the film, the tunnel was only one small room and had the entrance to the Chamber right before Harry, Ron, Flick and Lockhart. Although, before they enter the room, there is another passage seen on the opposite side.
* In the book, the entrance to the Chamber where Ginny was consisted of a solid wall on which two entwined serpents are carved, their eyes set with great, glinting emeralds and when Harry speaks Parseltongue to open the entrance, the serpents part as the wall cracks open and the halves slide smoothly out of sight. In the film, the entrance consisted of a circular door with 7 snakes on it that were on the edge of the door and when Harry speaks Parseltongue to open the entrance, an eighth snake appears from the cylinder bit where the snakes are held and goes all around the door and whenever it approaches each snake's head, the snake's head backs away and allows the door to be opened.

### 17. The Heir of Slytherin

* In the film, Harry, shortly after Riddle rearranged his name to unveil his true identity as Lord Voldemort, explicitly states the latter's the Heir of Slytherin. Harry does not do so in the book, though it was nonetheless made very clear what Riddle/Voldemort's connection to the Heir of Slytherin was.
* In the film, the Basilisk is seen chasing Harry all around the Chamber of Secrets whereas in the book, Harry's fight against the Basilisk occurs quickly and neatly. In the book, Harry never climbs up the statue nor does he go into the statue.
	+ In addition, Tom Riddle's reaction throughout the fight in the film was significantly calmer compared to the book. In the film, outside of yelling "No!" in shock and stating that the Basilisk can still use its other senses (see below), he does not react in any way to the Basilisk missing Harry. In the book, Tom Riddle is repeatedly yelling at the Basilisk to smell Harry when it is repeatedly missing Harry in their fight.
	+ The film also has Riddle claiming that Harry Potter's parseltongue abilities are of no use against the Basilisk, as it was specifically trained to only obey him, something that was not in the book (and which conflicted with the revelation later on that Harry Potter was one of Voldemort's horcruxes).
* The Chamber has a different depiction
	+ The statue at the end of the Chamber of Secrets is a full body statue of Salazar Slytherin, while in the film it is only a large statue of Slytherin's head and shoulders. The book *Harry Potter Page to Screen: The Complete Filmmaking Journey*, has Rowling reveal that the Chamber is flooded centuries after its creation and the rest of the statue below his head is submerged beneath the water. This also explains why the Basilisk was seen emerging from the water near the statue when Harry attempts to wake the nearly-dead Ginny.
	+ In the book, pillars hold up the ceiling of the Chamber of Secrets. In the film, there is nothing to hold the ceiling up (although two pairs of pillars do appear in the game version in the) but it shows that there were two lines of giant statues of snakes' heads where the pillars were in the book. It is also possible that the original Chamber hall is submerged along with the original pillars and that the snake head statues are the remainders of the pillars.
* In the book, after Fawkes had punctured the Basilisk's eyes, Riddle stated that it can still smell Harry. In the film, Riddle stated that it can hear him.
* In the book, Fawkes uses his tears to heal Harry while Riddle is still alive, but in the film Fawkes does not use his tears to heal Harry until *after* Riddle's destruction, as such Ginny wakes up and sees the dying Harry.
* In the book, in the Chamber of Secrets, Harry puts on the Sorting Hat and shouts at it for help. The sword then comes out and hits him on the head, nearly knocking him out. In the film, the sword just all of a sudden materialises in the hat when it's just lying on the ground, and Harry takes it.
* In the book, Harry Potter only destroyed the diary with the basilisk fang after he was healed by Fawkes. In the film adaptation, Harry destroyed the diary with the fang *before* he was healed.
	+ In addition, the book only mentioned that Riddle's memory writhed and then faded away after the diary was destroyed, while in the film, it was shown that Riddle's memory's chest cavity ripped open with light, then destroying his eyes and causing damage to his face, before eventually causing gaping holes throughout his body upon exploding.
	+ Lastly, Harry Potter only stabbed the diary once in the book, while in the film, he stabbed the diary three times, two being in two different sections of the book, and the last from the outside.
	+ A Star Wars reference is included in the scene where the diary is destroyed. During the first and second stabs, as light bursts out from Riddle, the sound of an igniting lightsaber is heard.
* The film has Ginny reacting in a significantly calmer manner when awakening shortly after Tom Riddle's memory was destroyed than in the book. In the latter, in addition to admitting her unwilling role in the disaster, Ginny clearly was breaking down from the entire ordeal. Similarly, because of the switching around of Fawkes healing Harry and the destruction of the diary (see above), Ginny also notices that Harry was injured, something that was not the case in the book.
* In the book, when Harry and Ginny find Ron, Flick and Lockhart, Lockhart (having lost his memory) says "Hello," that the chamber is an odd sort of place and asks if the four live there to which Ron answers "No." In the film, this occurs before Harry enters the Chamber and finds Ginny and Lockhart having just caused the tunnel to collapse. He says "Hello," asks Ron and Flick who they are, to which Ron replies "Um... Ron Weasley," and Lockhart responds, "Really? And who am I?". Flick then says to Harry through the gap hole of the rocks that Lockhart's Memory Charm backfired and that he hasn't got a clue who he is. Lockhart then picks up a stone, gives it a short throw and asks Ron if he lives in the Chamber (also also gives the stone to Ron) to which Ron replies "No." and Lockhart replies "Really?" and then Ron does something he never did in the book; he hits the stone on the top of the left side of Lockhart's head and he falls back down (presumably unconscious).
* The departure from the Chamber is depicted differently in the film and the book by the end of the characters' journey with Fawkes.
	+ The book states that the journey ends in Moaning Myrtle's bathroom in the morning, where the entrance seals shut again, and they head to McGonagall's office.
	+ The film shows that the characters are carried by Fawkes to a cave entrance in a cliff wherein a full moon gleams and they land onto the grounds of Hogwarts, then head to Dumbledore's office. The landing at the Hogwarts grounds and heading to the Headmaster's Office is done off-screen.

### 18. Dobby's Reward

* In the film, when Lucius arrives at Dumbledore's office and Harry notices Dobby, he is shown realising that Dobby's masters were the Malfoys and thus explained why he was hesitant to reveal anything directly or his self-inflicted punishments, with Lucius then giving a veiled threat to the house elf in response. This did not happen in the book (largely because Dobby had already been speculated to be part of the Malfoy family much earlier in the book).
* In the book, Harry's conversation with Dumbledore after the defeat of the basilisk is set in McGonagall's office, and Arthur, Molly, and McGonagall are present at the start of the scene. In the film, the scene is set in Dumbledore's office instead, and Arthur, Molly, and McGonagall do not appear.
* In the book, Harry accused Lucius of deliberately supplying the diary to Ginny Weasley at Diagon Alley while they were still in Dumbledore's office and Lucius is meeting with Dumbledore due to Dobby's nonverbal hints, with Dumbledore also giving a veiled threat to Lucius in response to this as well as his forcing the board of directors to sack Dumbledore. In the film, Harry's accusation occurs after Lucius leaves (although still due to Dobby's nonverbally hinting at Lucius's connection to the diary before departure), and Dumbledore, while still implicitly warning Lucius about his actions with the diary, is not notified by Harry about Lucius's action with the diary.
* In the film, Lucius Malfoy's sarcastic statement about Harry and Harry's response was improv from the actors.
* In the book, to free Dobby, Harry puts the diary in his sock and had Lucius Malfoy throw it so Dobby would catch it after he removed the diary, but in the film Harry puts his sock in the diary and had Lucius give the diary with the sock to Dobby unknowingly instead.
* In the book, just after Dobby was freed, Malfoy raises his wand threateningly at Harry, before Dobby tells him to leave. In the film, it sounds like Lucius Malfoy starts saying "Avada Kedavra" before Dobby blasts him backwards across the hall (the spell was the result of an ad-lib by Jason Isaacs).
* In the book, Lucius Malfoy says to Harry, "Someday you'll meet the same sticky end as your parents. They were meddlesome fools too." In the film, he said, "Your parents were meddlesome fools, too. Mark my words, Potter - one day soon, you're going to meet the same, sticky end."
* During the dinner scene, the scene where Gryffindor wins the House cup again is cut, though it is nonetheless implied.
	+ Hermione originally hugged Harry, Ron and Flick in the book upon revealing that she had been cured. In the film, she only hugs Harry and Flick, and just gives a hesitant handshake to Ron (note, this was the result of Emma Watson being hesitant to hug both Daniel Radcliffe and Rupert Grint in public view, with her hugging Radcliffe during filming having to be frozen for a few seconds to get the desires effect due to Watson breaking the hug too quickly). This also unintentionally foreshadowed her and Ron's hesitant blossoming feelings for each other in the succeeding films.
	+ In addition, Hagrid's arrival has him apologising for his lateness, explaining his release from Azkaban was delayed due to the letter requesting his release getting lost, and proceeding to blame a bird named Errol for it getting lost, causing Ron to give a slightly embarrassed look. This was not present in the book.

## Prisoner of Azkaban

### 1. Owl Post

* The film starts with Harry performing *Lumos Maxima*, well aware of the Restrictions of Underage Wizards and did not receive any warnings; every time he does it, Uncle Vernon would come to see what was happening and Harry would hide under the covers. In the book, Harry uses a simple torch. Lumos Maxima is later used in the sixth film.
* Harry does not receive birthday presents from his friends and Harry does not find out about the Weasley's visit to Egypt until he gets to the Leaky Cauldron.
* The film does not mention Ron receiving a new wand to replace his old broken one. However, Ron actually does have a new wand, since there is no spello-tape on his wand and no malfunctions happen.

### 2. Aunt Marge's Big Mistake

* In the book, at the dinner party, Aunt Marge allows Ripper to drink tea off a saucer. In the film, she allows him a drink of brandy from her glass.
* In the book, Aunt Marge stays for a week before she gets blown up. In the film, Aunt Marge blows up the same day she visits.
* In the book, Harry sat at the table with Aunt Marge and the Dursleys, but in the film, he is just busy at the kitchen counter serving the Dursleys and Aunt Marge.
* Also in the book, Marge only floats up to the ceiling, while in the film she uncontrollably floats out of the house, later to be found circling a chimney in Sheffield as Harry is leaving. The same scene also has a humorous segment where Vernon tries to save Marge and cling to her to get her back down, only to end up bitten in the leg by Ripper, causing Marge to demand that Vernon not release his grip on her, only for Vernon to reluctantly do so due to being unable to hang on for much longer thanks to Ripper, apologising just before doing so.

### 3. The Knight Bus

* In the book, Harry pretends to be Neville Longbottom while on the Knight Bus, running from the Ministry of Magic. In the film, Harry doesn't pretend to be Neville; however, his identity is still kept secret.
* The film makers added shrunken heads that have the ability to talk, probably to add humour. So far these creatures have been unique to this film only.
* Harry asking Cornelius Fudge to sign his permission form is taken out.
* In the book, Harry still has only two weeks of vacation remaining before returning to Hogwarts, following the incident of blowing up Aunt Marge as mentioned by Fudge, but in the film, Harry returns to Hogwarts the next day after having arrived at the Leaky Cauldron.
* In the book, Harry reunites with Hedwig in his room at the Leaky Cauldron with Tom telling Harry that Hedwig arrived five minutes after he did, but in the film, Harry reunites with Hedwig with Tom telling Harry that Hedwig arrived five minutes before Harry did.

### 4. The Leaky Cauldron

* There are no scenes in Diagon Alley in the film, resulting in Harry reuniting with Ron, Flick and Hermione in the Leaky Cauldron lounge. It should also be noted that Harry sees Crookshanks chasing Scabbers before he reunites with them, implying Hermione had already bought Crookshanks before meeting Harry.

### 5. The Dementor

* During the train ride, Malfoy, Ginny and Neville do not come into the quartet's compartment.
* The Frog Choir doesn't exist in the book and the director only added it for the film, however, it was later mentioned in the sixth film as well (in the scene in which Professor Flitwick uses "emergency choir practice" as an excuse to escape a conversation with Professor Slughorn).
* McGonagall doesn't call away Harry, Flick and Hermione prior to the feast.

### Talons and Tea Leaves

* Professor McGonagall's Transfiguration classes never happen at any point in the film, and as such, she never performs her Animagus ability or tells the students not to listen to what Trelawney says. Potions classes also never happen.
* When the Gryffindors and Slytherins go to their first Care of Magical Creatures lesson in the book they visit the Hogwarts Hippogriff herd, but in the film Buckbeak appears to be the sole hippogriff at Hogwarts.
* The film has scenes that suggest a growing romance between Ron and Hermione. During their first Care of Magical Creatures class, Hermione grasps Ron's hand when Harry goes up to Buckbeak, which surprises him. Later on in Hogsmeade, they stare at the Shrieking Shack with Ron confusing Hermione's dialogue when she spoke of "getting closer" to the Shack. Then after Buckbeak's apparent execution, Hermione starts crying and hugs Ron.
* When Harry rides on Buckbeak in the film, they fly all the way to the Black Lake; in the book, they fly only once around the paddock in the Forbidden Forest.
* In the book, Harry doesn't quite enjoy his first ride on Buckbeak, and it's made clear between Hippogriffs and broomsticks which one he prefers. But in the film, during his first ride on Buckbeak, Harry is fascinated by the ride and enjoying it a lot as they fly over the Black Lake, raising his arms and shouting in triumph. The film portrayal also depicts a much longer ride, with Buckbeak achieving a sort of smooth, idyllic glide not described in the novel.
* In the novel, Malfoy is bleeding from his arm after Buckbeak attacks him which falls on the grass. In the film, Malfoy is not bleeding and only a piece of white from Buckbeak's scratch can be seen, although it's probably just Malfoy's shirt as it seems Buckbeak slashed his robe sleeve open.
* The part of Bem was created solely for the film and he explains to Seamus Finnigan what the Grim is and also expresses his concern over the Dementors effectiveness at catching Sirius.

### 7. The Boggart in the Wardrobe

* In the book, Harry, Ron, Flick and Hermione make their way to Defence Against the Dark Arts class, when Flick and Hermione disappear but then reappear a few feet behind them. In the film, Harry and Ron are already in the classroom when Flick and Hermione appear during the lesson.
* In the book, Parvati Patil's boggart is a mummy; in the film, it is a giant snake.
* In the book, Flick hesitates and pushes Ron in front of her to face the Boggart. In the film she appears excited to face it but is unable to because she is in line behind Harry and doesn't get the chance.
* In the book, the Boggart which had transformed into a spider to scare Ron, loses its legs when Ron casts the spell on it and rolls over to Harry, where Lupin prevents it from transforming, while in the film Ron conjures some roller blades to appear on the spider's legs, after which Parvati faced it, and it transformed into a massive serpent, but was again countered, after which it was faced by Harry, upon which it transformed into a Dementor, upon which Lupin stopped it and sealed it back into the cupboard.

### 8. Flight of the Fat Lady

* While the book has Peeves describe Sirius Black's attack on the Fat Lady's portrait after learning about this from her when he saw her in a portrait on the fourth floor, in the film it was the Fat Lady herself that described the attack from a nearby portrait.
* In the book, while Harry cannot go to Hogsmeade Flick chooses to stay behind with him and they both go and see Lupin, where they spend their time in his office and see a Grindylow which Lupin was taking delivery of for their next lesson, while in the film Flick goes to Hogsmeade and Harry and Lupin talk on the Wooden Bridge after apparently meeting there. This difference creates a continuity error in the seventh film when Lupin interrogates Harry after the Battle of the Seven Potters holding his wand to Harry's face and asking him "what creature sat in the corner the first time Harry Potter visited my office in Hogwarts." A deleted scene is assumed to show this, before the two of them went for a walk on the Wooden Bridge.

### Grim Defeat

* Sir Cadogan never appears, and as such his role of replacing the Fat Lady as Gryffindor's portrait is only shown as a deleted scene.
* In the novel, when Snape substitutes for Lupin in Defence Against the Dark Arts, Harry and Flick are 10 minutes late and Snape takes 10 points then another 5 when Harry is told to sit down, but continuously asks where Lupin is. Hermione then says that they had done Boggarts, Red Caps, Kappas and Grindylows and that they're about to start something else before being cut off by Snape and a moment later when he announces that they will start a lesson about werewolves, but Hermione tells him that they are not meant to start that topic yet and that they're due to start Hinkypunks. Snape then asks Flick to tell him how to distinguish between the werewolf and the true wolf, which she refuses, before he then criticises Hermione and deducts an extra 5 points from Gryffindor which Ron shouts at Snape for and he gives Ron detention. In the film, this is all different in some ways and this scene also has a few moments that did not occur in the book:
	+ Harry is already in class before Snape enters, so Harry is not at all late. This also omits Snape taking the first 15 points from Gryffindor. However, Harry asks only once in the film where Lupin is and Snape replies "That's not really your concern, is it, Potter? Suffice it to say that your professor finds himself incapable of teaching at the present time."
	+ Hermione tells Snape that they had just began learning about Red Caps and Hinkypunks and are not meant to start werewolves for weeks before Snape tells her to be quiet. Also, Hermione learns Snape will be teaching werewolves after he does an action that does not happen in the book; he sees Ron turning his pages one-by-one before Snape makes a movement with his wand and the books turns to page 394 (as Snape requested) and Ron says "Werewolves?"
	+ Another thing that occurs in this scene that didn't happen in the book is the class having a projector which is why Snape, when he enters, magically closes all the windows shut.
	+ Snape asks the class who can tell him the difference between an Animagus and a werewolf.
	+ Ron remains quiet and calm and does not get detention when Snape takes 5 points from Gryffindor when accusing Hermione of being an "insufferable know-it-all." In fact, he whispers his agreement with Snape to Harry, stating that Snape has a point.
* Because the first match is the one shown in the film, it is unknown if the games against Ravenclaw and Slytherin still take place: as Harry doesn't receive his new broom until the end of the film.
* In the book the rain during the Hufflepuff Quidditch match makes it difficult for Harry to see until Hermione casts *Impervius* on his glasses. In the film, the Quidditch players wear goggles.
* Also in the book, Harry falls off his broom and Cedric Diggory catches the Snitch. In the film, the Hufflepuff Seeker is struck by lightning and Harry falls of his broom, leaving the Snitch apparently uncaught. Also in the film, Angelina Johnson crashes after her broom catches fire which never occurred in the book.

### 10. The Marauder's Map

* The origins of the Marauder's Map are not revealed in the film. The whole storyline of the Marauders is left out. Potential continuity errors are avoided in later films when Voldemort refers to Pettigrew as "Wormtail" in the dream Harry witnesses ( *Goblet of Fire*) and Moody refers to Sirius as "Padfoot" in front of Harry (in *Order of the Phoenix*), which allows for Harry to know their nicknames. In the film Sirius shows knowledge of the map stating that the map never lies.
* In the film, Harry's two visits to Hogsmeade are combined into a single trip.
* In the book Ron, Flick and Hermione were with Harry when he eavesdropped on Fudge's conversation with staff and Rosmerta. In the film Harry was alone as the Inn forbade under-age wizards from entering the pub that day. Also in the film Harry snuck in using his Invisibility Cloak, while in the book he hid underneath the table as he did not bring the cloak during his first visit to Hogsmeade.
	+ In the film, this conversation is taken to a private room, with only Harry, Rosmerta, McGonagall, and Fudge present.
	+ In the film, the storyline of Sirius also being accused of Charlotte Potter's murder is omitted.
	+ In the film, Harry's reaction to the truth is limited to a single scene where he angrily swears he would kill Black. In the book, this was more drawn out where Harry was both angry and depressed for days with nightmares over this fact and that the people who knew the truth did not bother to tell him.

### 11. The Firebolt

* In the book, Harry received his Firebolt for Christmas right after his Nimbus 2000 was destroyed. Eventually, Sirius Black revealed that he had sent the broom. In the film, Harry receives the Firebolt at the end of the film, and although there was no note, Hermione shows Harry that one of Buckbeak's feathers came with it.
	+ In addition, the book had Professor McGonagall confiscating the Firebolt shortly after Harry received it to check for jinxes after Hermione notified her of it, under suspicions that Sirius Black sent it, and taking months before Harry was allowed to use the Firebolt. All of this was omitted from the film due to the switching of when the Firebolt was given and as such Harry does not get into an argument with Hermione.
* In the book, Ron and Hermione get in a huge argument because of the problems with their pets; in the film most of this is omitted, except for some of Ron's initial arguments with Hermione which didn't go as far as the book.
* Neither Hermione, Flick or Ron attempt to help Hagrid prepare for Buckbeak's trial in the film.

### 12. The Patronus

* In the book, during his first anti-dementor lesson, Harry tries to ward off the dementor twice unsuccessfully before succeeding. But in the film, he only tries once unsuccessfully before succeeding. Also, Harry's memory in the book that works is the memory of how happy he was that he would be leaving the Dursleys. In the film, he uses a made-up memory of his parents.

### 13. Gryffindor Versus Ravenclaw

* In the film, the part where Sirius tries to kill Wormtail disguised as a rat in the middle of the night with a knife scaring Ron and slashing his bed curtains is omitted. However, the scene where McGonagall is in the Common Room and Ron tells about what happened is included in a deleted scene.
* Due to Quidditch being mostly written out, Cho Chang does not appear until the next film.

### 14. Snape's Grudge

* Harry throws snowballs at Draco and his cronies while under the Invisibility Cloak in the outskirts of Hogsmeade. In the novel, he throws mud-balls. The scene is also extended, with Harry also debagging Crabbe and kicking his backside, pulling Pike's hat over his eyes and swinging him around by his scarf, and dragging Malfoy away by his feet. Omitted from the film is the hood of the cloak falling off Harry's head causing Malfoy to learn of Harry's unauthorised visit, so no one (except Ron, Flick, Hermione, Fred and George) knows of Harry's illegal visiting.
	+ Hermione is also watching this with Ron and Flick in the film. In the book, Harry and Ron had not reconciled their problems with Hermione yet so she was elsewhere.
* In the novel, while trying to make the Marauder's Map "reveal its secrets," Snape tries once and fails. He then tries again with different words and it fails. He tries once more, again with different words, and it finally insults him. In the film, he only tries once and it insults him.
* In the film, the "Snape's Grudge" scene happens at night when Snape catches Harry in the hallway after he saw Pettigrew's name one night on the Marauder's Map and went to find him. In the book, Snape catches Harry in the hall right after he climbed up the One-Eyed Witch's hump after being seen by Malfoy in Hogsmeade. Both versions of the "Snape's Grudge" scene end with Lupin taking the map.
	+ Due to the differing circumstances to how Harry was caught in the film, Ron and Flick are absent from this scene. In the book, Ron and Flick came and claimed the map was from Zonko's Joke Shop to help cover for Harry and were also present when Lupin lectured Harry about the map after Snape left.
* In the book, when Professor Snape is insulted by the Marauder's Map, each Marauder says something different to Professor Snape, with Lupin saying the bit about Snape minding his own business. In the film, however, that is all that the map says. Additionally, in the book, Snape recognises the Marauders' nicknames and angrily summons Lupin, wanting to know if he gave Harry the map. In the film, Snape shows no sign of recognising the names, instead berating Harry for the insults the map produced.

### 15. The Quidditch Final

* In the novel, Hermione slaps Malfoy and he reacts passively. In the film, this is slightly extended. Instead, Hermione first draws her wand on Malfoy, and then punches him in the face, in both situations he acts cowardly.
* In the books, Hermione was walking behind Harry, Ron and Flick on their way to Charms, but when they get to the class she is gone, and they don't know where she is until later that day when they find her sleeping on her Arithmancy book in Gryffindor Tower. None of this happens in the film.
* Due to Quidditch mostly being written out in the film, the part of Gryffindor winning the Quidditch Cup was omitted.

### 16. Professor Trelawney's Prediction

* In the film, after Hermione storms out of the Divination lesson from being insulted by Trelawney, on her way out, she knocks a Crystal Ball off the table and it rolls down the Divination Stairwell. Harry notices it on his way out and decides to take it back to the classroom. He then finds Trelawney in a trance and it is here where she tells him a prophecy. In her book her trance takes place during Harry's exam.
	+ Because of the Divination exam being omitted Flick no longer sees Buckbeak's "death" or Sirius attacking Ron in the crystal ball.
* In the book, while the quartet are on their way to Hagrid's hut when Buckbeak's execution is to take place, they bring Harry's Invisibility Cloak with them, but in the film, they do not bring the cloak at all.
* In the novel, during the quartet's visit to Hagrid, they follow him out to his back garden where he comforts Buckbeak and says "It's okay, Beaky." This is omitted from the film, as Hagrid doesn't have a garden and Buckbeak is laying right outside the front of Hagrid's hut.
* In the film, in Hagrid's hut a jar of yellow powder breaks which appears to have been thrown by a kind of rock fossil and then another one hits Harry on the back of the head. This causes Harry to turn and show Hagrid that Dumbledore, Fudge and Macnair are coming. In the novel, Hagrid just sees the party coming through his window and tells the quartet to leave and there is no vase broken.
* The feeble, elderly member from the Committee for the Disposal of Dangerous Creatures never appears.

### Cat, Rat and Dog

* In the film, after Buckbeak's apparent execution, Hermione starts crying and hugs Ron. This never happens in the book.
* Crookshanks never recognises Sirius as an Animagus in the film.
* In the book, Ron is generally depicted as being brave and heroic under stress while Hermione was depicted as being nervous, terrified/frightened. In the film, Ron's bravery was transferred to Hermione and Hermione's nervousness/terror was transferred to Ron.
* In the film, Ron saw Sirius/Padfoot appear and pointed the dog out to Harry, Flick and Hermione in a quivering, frightened tone of voice. In the book, Flick knows that Sirius is coming because she had seen it happen during her Divination exam and yells "Snuffles, no!" to try and warn him not to.
* In the book, Sirius (in Animagus form) had grabbed Ron by the arm and that Ron's leg was broken when he tried to use one of the Whomping Willow's roots to hold them in place to avoid being dragged off only for the pressure to break his leg. This was changed to Ron behind grabbed by the leg in the film likely for being too graphic.
* In the book, Flick manages to get through the Whomping Willow and to the Shrieking Shack on her own because she had been there before visiting Sirius as she believed he was innocent. In the film she enters the Shrieking Shack with Harry and Hermione, as she had never visited Sirius before and did not believe him to be innocent.
* In the novel, when Hermione and Harry find Ron and Flick in the Shrieking Shack, Sirius disarms Harry and Hermione with Ron's wand and catches their wands, but in the film, he does not as he does not have Ron's wand. However, Harry does get disarmed by Lupin the moment he enters the room in both the book and film, while in the film both Flick and Hermione's wands are in their pockets, but in the novel, Lupin blasts Harry's wand away and two other wands that Hermione was holding and Lupin catches them all deftly (Flick was not disarmed as she had been standing protectively in front of Sirius). Also, in the film, when Lupin disarms Harry, the latter's wand disappears near the staircase. Ron is not disarmed in the film, although like Flick and Hermione, he does not consider using his wand.
* The following text appears in the book, after Harry and Hermione find Ron, Flick and Sirius in the Shrieking Shack: Ron spoke to Black. "If you want to kill Harry, you'll have to kill us too!" he said fiercely, though the effort of standing upright was draining him of more colour, and he swayed slightly as he spoke. In the film, the line was spoken by Hermione while Ron remained in the corner and did not say or do anything.
* This quote is also said in the book, after Lupin enters and greets Sirius as an old friend: "I trusted you, and all the time you've been his friend!"; it was shouted at Flick and Lupin by Harry, but in the film, it is Hermione who shouts this at Lupin when she thinks both he and Sirius are wanting to kill Harry when Sirius says "Let's kill him!" (although he was actually referring to Peter Pettigrew). She also first shouts "NO!" before saying Harry's line from the novel.
* In the film, after seeing Pettigrew's name on the map, Harry says this to Lupin. In the book, Harry never saw Pettigrew's name on it, and Lupin was the one who saw Pettigrew's name after acquiring the map and using it on the same day as Buckbeak's execution, since he knew Harry, Ron, Flick and Hermione would visit Hagrid that day. These events are what caused Lupin to believe that Sirius is innocent.

### Moony, Wormtail, Padfoot, Prongs and Kit

* The story of Lupin's connection to the Shrieking Shack and Whomping Willow is omitted.
* In the novel, Snape appears in the Shrieking Shack after pulling off the Invisibility Cloak, but in the film, as the quartet didn't bring the cloak with them, Snape appears visible and is seen when he disarms Sirius.
* Also, in the film, Snape disarms Sirius since Lupin passed his wand to him (Sirius) when Sirius was wanting to kill Pettigrew. In the novel, Lupin never gave his wand to Sirius, so Snape never disarms the latter.

### 19. The Servant of Lord Voldemort

* As the identities of the Marauders are not revealed until the fourth and fifth films, it causes a bit of confusion as to why Snape has such a hatred towards Sirius and Lupin in the third for those who have not read the books. In the novel, Snape is as eager to hand over Lupin to the dementors as well as Sirius, despite the fact that there is not any evidence supporting Snape's claim that Lupin was helping Sirius into the castle, which he was not.
* In the film, Lupin pleads with Snape while Sirius continues to taunt him. Snape is more calm (albeit still spiteful), confronting the two, as opposed to the book, where he seems to be angry and even more reluctant to listen, as he bounds and gags Lupin, threatens Flick with suspension and states that Harry deserved to be killed by Sirius.
* In the book, Harry, Ron, Flick and Hermione all try and disarm Snape at the same time, causing him to hit against the wall and go unconscious. In the film, it is only Harry who does this, as seen when he sneakily pulls Hermione's wand from her pocket. Ron, Flick and Hermione are shocked that Harry did this, as Snape is a teacher.
* In the book, Ron hesitates before giving Scabbers to Lupin. In the film, it is Sirius who takes Scabbers from Ron, and he does it by force, instead of Ron giving Scabbers to him freely.
	+ Similarly, when Sirius explains that Peter Pettigrew is alive and fingers who it is, Ron initially thinks Sirius truly is insane, thinking Sirius was referring to him, before Sirius clarifies that he was in fact referring to his pet rat, Scabbers, whom he was holding at the time.
* In the book, it takes a while for Peter to confess to betraying Lily and James Potter, while in the film, he confesses almost immediately, as the film versions almost always cut to the chase.
	+ His confession of killing Charlotte Potter is omitted.

### 20. The Dementor's Kiss

* In the books, a transformed werewolf is described as looking almost like a true wolf except for a few subtle differences like the shape of the snout and tail and the eyes. However in the film, a transformed werewolf looks more like the anthropomorphic versions from other werewolf films.
* In the book, Snape had been unconscious because of the spell cast by Hermione, Flick, Ron and Harry and had to be suspended in mid-air by magic to be brought out of the Shrieking Shack. He was not there to protect the quartet when Lupin transformed into a werewolf, but in the film, Snape was left behind, but suddenly regained consciousness to protect the quartet from Lupin. In the book, Snape regains consciousness only after Sirius, Hermione, Flick and Harry become unconscious because of the Dementors.
* In the film, while Sirius and Lupin (both transformed) fight, Harry runs up and throws a stone at Lupin, hitting him on the back of the head to try and attack Harry, until the sound of a female wolf (sounding like Flick's voice) stops Lupin and then runs away. Harry never threw anything at the transformed Lupin in the book.
* In the book, Flick and Hermione are with Harry and Sirius when they are attacked by the Dementors. In the film, they attempt to run after him, but are stopped by Snape, forcing them to stay behind with Ron, who is not unconscious but has a broken leg and would likely be unable to keep up with Harry if he, himself, tried to go after him.
* In the book, Ron is obviously stunned unconscious by Peter Pettigrew with Lupin's wand (which puts him in danger of hurting his leg worse), but in the film, Ron is not stunned and remains conscious the whole time.

### 21. Flick and Hermione's Secret

* In the film, Dumbledore instantly believes the quartet, like in the book and gives them rules how to rescue Sirius. When Dumbledore is telling them this, however, he absent-mindedly taps Ron's bandaged leg which does not happen in the book.
* In the book, Dumbledore tells Harry and Flick that Sirius is locked up in Professor Flitwick's office in the West Tower, thirteenth window from the right of the tower, but in the film, Dumbledore tells them that Sirius is locked up in the topmost cell of the Dark Tower.
* In the book, when Harry and Flick go back in time, the whole view of the hospital wing disappears and different colours and shapes blur around them until they soon land in the deserted Entrance Hall, but in the film, when they go back in time, they remain standing in the hospital wing while Harry watches themselves as well as others who were in the hospital wing since the previous three hours doing everything backwards until the whole thing stops. This means that the view does not disappear and no different colours or shapes appear around Harry and Flick in the film.
* In the film, when Harry and Flick go back in time, Flick throws 2 ammonite fossils at both Hagrid's pot (because that had happened) and at Harry to get his attention, so he can see Fudge and Macnair coming to Hagrid's hut. Flick later howls like a wolf to call Lupin away from fighting Padfoot, in turn causing him to come after them instead, at which point they are rescued by Buckbeak. In the novel, neither of these two events occur. All those events revealed they never actually changed the present, but instead were already part of the actions unseen previously by their past selves.
	+ This kind of time-travelling interaction is known as a "bootstrap paradox" or casual loop, where the interaction between a time-traveller and their past self is a loop of actions and inspirations without an exact beginning or end.
* In the film, Flick is with Harry when he saves himself and Sirius from the Dementors, instead of with Buckbeak.
	+ In addition in the book, when Harry is about to break out into the open, he points out to a protesting Flick that they need to get out into the open, not to interfere, but to evade the then-incoming (and recently-transformed) Professor Lupin. This was obviously changed in the film.
* In the book, Harry figured out that he was the one that cast the Patronus that saved their past selves before using it. In the film, as Flick was with him, she convinces Harry that no one is coming to save them leading Harry to cast the Patronus and realising the truth afterwards.
* In the film Harry's Patronus creates a cool light show. This never occurs in the books; not even a full-bodied patronus produces this.
* In the book Flick rescues Sirius with "Alohomora," but in the film she uses "Bombarda," a spell made up for the films. In the French adaptation of the film, the spell "Alohomora" is used instead.

### 22. Owl Post Again

* In the film, when Harry and Flick go back to the hospital wing after saving Sirius and Buckbeak, Ron is already awake and asks how he and Flick got outside the wing, when they were right in front of him. In the novel, Ron is still sleeping when they get back.
* In the novel, when Harry and Flick arrive in Lupin's office, Lupins tells them about his resignation, that he resigned because Snape told the Slytherins about Lupin being a werewolf until Dumbledore comes in. When Dumbledore is there, they discuss about Harry feeling bad for not letting Lupin and Black kill Pettigrew, realising he would help Voldemort return from Trelawney's prophecy. Dumbledore reminds Harry that he saved Black, an innocent man, from a terrible fate, that Pettigrew owes a life debt to Harry for saving him, which Dumbledore is sure will prove useful later one. Dumbledore also mentions that Harry has some of his father's qualities, which is why his Patronus took the form of Prongs (a stag). In the film, it is Lupin that tells Harry all this. Also:
	+ Snape is not identified as being the one revealing the secret of Lupin's condition.
	+ There is no mention of why Harry's Patronus is a stag, though it was included in the original script.
	+ Harry appears to say that he feels sorry for not letting Sirius and Lupin kill Pettigrew although in a very different way (if this is true): "None of it made any difference. Pettigrew escaped."
	+ There is no talk about Trelawney going strange, when she was actually making the second prophecy.
	+ Dumbledore is not present with Harry and Flick as they go to visit Lupin in his office as he is leaving.
* The part of Ron receiving Pigwidgeon from Sirius to replace Scabbers was omitted. This caused a continuity error with the following films where Ron was seen with him, without any explanation on how he got an owl, though of course he could have gotten an owl by other means and as Pigwidgeon is very small he would likely be a cheap owl for Ron to get.
* The letter addressed to Harry that Sirius sent with Pigwidgeon which gave him visitation rights to enter Hogsmeade was omitted. This caused some continuity errors in the following films of Harry being able to enter Hogsmeade freely.
* The part where Harry meets Uncle Vernon on the platform at King's Cross was omitted in which he tells his uncle that he has a godfather, who has escaped from wizard prison.