List Of-Differences Between of The Harry-Potter Books and The Harry-Potter Films

Template:Out of universe
Template:Expand
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).

### 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 *Chamber of Secrets* where Professor Sprout gives 5 points to Gryffindor, and the other in *Prisoner of Azkaban,* when Snape takes 10 points from 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
	+ Peeves
	+ Ludo 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 the 'Philosopher's Stone' and most of the classes that introduce a new teacher (the first Defence Against the Darks Arts class from years 2-5, first Care of Magical Creatures class and first Divination class in Prisoner of Azkaban, and the first potion's 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 Darks Arts lesson in each films except for 'Prisoner of Azkaban', no History of Magic lessons, no Potions lessons outside of the first and sixth film (not including the potion's scene from 'Order of the Phoenix' that lasted 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 as well as the Privet Drive sign.
	+ The existence of ***Ted*** and ***Jim McGuffin***.
	+ The 'changed sleeping pattern' of the nations owls who have been flying in daytime across Britain
	+ The peculiar 'shooting stars' that was reported by the weatherman.
* 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 care when she said she had 'watched them all day'.
* Dumbledore uses his ***Deluminator*** 5 times in the film however in the book he clicks it 12 times. Assuming that the number of street lamps is the same this leaves 7 lights still on in the film, thus giving reference to the magical number of ***Seven***.
* In the books there is a moment when Dumbledore and McGonagall are discussing about Voldemort's name and McGonagall then builds up the courage to say it instead of 'You-Know-Who'.
* Also there is no reference to where Hagrid got the motorbike from in the films, however in the books Dumbledore asks Hagrid about this, to which he replies 'young Sirius Black'.
* 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 he 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.
* 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 holiday 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***, while 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 film, Vernon pulls Harry by the hair demanding that Harry tell what happened; when Harry 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!'
* In the book, the glass of the snake tank remains vanished. In the film it returns, trapping Dudley in the tank.
* 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 (But there was a sign in the film saying 'Burmese 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. Curiously, in the Brazilian Portuguese dub of the film, Harry says that the snake comes from Brazil.
* In the book, the snake addressed Harry as 'amigo' when thanking him for freeing it - presumably, a nod by J.K. Rowling to its South American ancestry as 'amigo' means friend in Portuguese and Spanish. In the film, the snake simply says 'thanks'.
* In the film Harry states that his encounter was like magic, to which Vernon replies 'There's no such thing as magic'. This isn't mentioned in the books as Vernon only manages to say 'Go - cupboard - stay - no meals,'.

### 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.
* The scene when Harry gets Dudley's second bedroom is omitted. He does get the room in the second film, with the latter film implying that the Dursleys supplied Harry with the room after the 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.

### 4. 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 Dursley*** 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.
* In the book, Harry does not say 'Thank you' to Hagrid when he gives him a birthday cake, but in the film, he does.
* In the book, Hagrid immediately curses Dudley into getting a pig's tail after the former threatened Uncle Vernon upon the latter insulting Dumbledore. In the film, he instead curses Dudley after noticing that the latter was eating Harry's cake.
* 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 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 Mr Ollivander thought of the 11 inch holly wand with a phoenix feather core, but in the film he only tried two wands before Mr 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 of wands off the shelves and broke a vase.
* ***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.
* After his first visit to Diagon Alley, Harry returns to live with the Dursleys for several weeks and Vernon Dursley drives him to the train station. In the film, Harry went to the train station with Hagrid just after buying his school supplies.
* The character ***Peeves*** is omitted, although a scene was filmed for him, but ended up being cut, even being omitted from the current DVD release. Peeves never appeared in any of the films.

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

* In the book, Fred and George met Harry at the platform and helped him loading his trunk to the train. Post this they tell the rest of their family at the platform about this. They later appear with Ron in the train and introduce the two boys. While in the film, Ron introduces himself and finds about Harry in the train for the first time.
* 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 trio runs off to the library, so it only appears as a 'mistake'.
* In the book, Neville comes into the compartment where Harry and Ron 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.
* In the book, Draco Malfoy visits Harry with Crabbe and Goyle in the train compartment to meet the famous Harry Potter. This is where he insults the Weasley family and asks Harry to be his friend. When Harry declines, a fight breaks out. This scene is omitted in the film.

### 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, Malfoy, Susan Bones, Ron and Harry are seen to be sorted in the film, although the others were sorted after Harry, even though this is not shown.
* When students are called to be sorted, they place the hat on themselves, but in the film, Professor McGonagall does it for them.
* 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***s go bad from Hagrid in Diagon Alley. In the film, he learns it from Ron during the Sorting ceremony.
* In the book Percy Weasley wears glasses but throughout the films, he is seen without them.
* Hedwig's name is never mentioned, except in a deleted scene. The same goes for Mrs Norris. Both names are mentioned in later films.

### 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 should 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 on 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 one of the Patil twins 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 Class 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) 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 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. Hallowe'en

* In the book, Harry's first Quidditch training session takes place at 7:00 p.m., 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's receives his Nimbus 2000 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's 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 Hallowe'en prank.
* In the book, when Hermione is crying in the bathroom and Professor Quirrell announces that there is a troll in the dungeon, Harry and Ron go to find her and see the troll going into a room (not realising it's the bathroom) and lock the door thinking they've locked the troll into 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 and Ron see the troll's shadow emerging, they hide and watch the troll go into a room, and Harry says, 'It's going into the girls' bathroom!' and they go in to save Hermione.
* In the novel, when Ron tries to levitate his feather in Charms class 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* and 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 class, and later, his cup of water blows up while he is trying to turn it into rum. The act of Seamus's works blowing up on him would become a recurring joke throughout the film series.

### 11. Quidditch

* The scene with Harry in possession of the book QTA 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 bandaging his wounded leg.
* 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 book, Hagrid says that he bought Fluffy from a 'Greek chappie' while in the film, Hagrid says he bought Fluffy from an 'Irish feller'.
* In the film, Dumbledore is seen at the Gryffindor-Slytherin Quidditch match. In the book, Quirrell mentions under the trapdoor that he couldn't try to harm Harry at the Gryffindor-Hufflepuff Quidditch match due to Dumbledore being present. Therefore, Dumbledore couldn't have been at the Gryffindor-Slytherin Quidditch match in the book.

### 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 novel, 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 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 novel, Ron doesn't seem to know what the cloak is, but in the film he realises that it's an Invisibility Cloak when Harry puts it on.
* In the novel, 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 novel, 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.
* 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 Professor 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 Longbottom getting into a fistfight with Draco, Crabbe, and Goyle on the stands during the game is also omitted.
* In the film, Harry, Ron 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 and Hermione are reading the information about the Philosopher's Stone, Nicolas Flamel's 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 Trio that Dumbledore sent him to Romania (whether to Charlie or not it is not revealed, although it is mentioned in the film that Charlie works with dragons in Romania).
* When Harry and Hermione get detention, it is because they left the Invisibility Cloak in the Astronomy tower while sending Norbert to Charlie Weasley and were caught by Argus Filch at the foot of the stairs. 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. In the film, they get detention because Draco Malfoy saw them in Hagrid's ***hut*** past curfew (which is similar in the book, except that Draco did not inform 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

* Professor McGonagall takes 50 points from Slytherin instead of 20; She says '*50 points will be taken. Each.*' before saying '*All four 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, and Hermione.
* In the book version, it is mentioned that the other Gryffindors and Hufflepuffs/Ravenclaws were very upset with the Trio 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), however according to a Magazine article on the DVD release of the film, there was a scene filmed of Harry and Ron looking at the House Point Hourglasses in the Great Hall, but was not included in the film or on the deleted scenes of the DVD.
* Other than Ron serving detention in Neville's place for the film Harry is paired with Draco and ***Fang*** initially when the group 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. Firenze is the only centaur who appears. Bane later appears in the *Order of the Phoenix* film (but is not identified), while this would be Firenze's only appearance in the films.
* In the book, Harry gets a ride on Firenze's back and he escorts the boy 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, Firenze and the dead unicorn.

### 16. Through the Trapdoor

* In the book, when Harry, Ron and Hermione tell Professor McGonagall they have to see Professor Dumbledore, Harry almost says that Snape is going to try and steal the Philosopher's 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 and Hermione is omitted.
* Harry, Ron, and Hermione never have the flute that would put Fluffy to sleep, as they do in the book. Instead the trio enters the room under the Invisibility Cloak, spotting there a self-playing harp enchanted by Quirrell. Fluffy is asleep until the spell wears off. Also in the novel, the trio 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 Harry, Ron, and Hermione fall into the Devil's Snare, Hermione and Harry escape by relaxing, and Hermione saves Ron with Lumos Solem. In the novel, Hermione was able to find a damp wall and free herself before the plant had a firm grip on her. She 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 novel, Harry, Ron, and Hermione, each seizes a broomstick and kicks 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 spells, Harry being a Seeker, and Ron with Chess).
* 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).
* 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 acknowledged; In the film, Quirrell's ***second mountain troll*** and Snape's Potion Riddle are omitted, although they are present in the video game. Because of these omissions, Hermione stays with Ron after Ron was injured in the chess match at McGonagall's room instead of travelling with Harry as far as the Potions room before heading back. This is odd, since Hagrid tells Harry, Ron, and Hermione that Snape is one of the teachers protecting the stone. However, Snape's obstacle appears in 'Disc 2: Special Features' of the DVD. It is also possible that Snape could be a sort of 'private investigator' or 'security guard' who keeps an eye out for anyone trying to get to the Stone.

### 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 (Harry's) 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 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.
* In the book, Harry Potter is unconscious when Quirinus Quirrell dies, while in the film, Harry watches Quirrell die.
* 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.
* Once again, Nicolas Flamel's wife ***Perenelle*** is not mentioned when Harry asked about Flamel dying.
* In the book, Harry reunites with Ron 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.
* 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.

### Character physical appearance

Some notable differences exist between key cast members of the film, compared to the way their characters are described in the books:

* Hermione is described as having bushy hair and prominent front teeth, while actress Emma Watson has normal sized teeth and her hair, though bushy in this film, isn't as bad as described in the book (and later films do away with bushy hairstyles altogether).
* Harry has green eyes, but actor Daniel Radcliffe, who has blue eyes, was unable to wear contact lenses, due to an ***allergic*** reaction (except in one scene - see below). Harry is also described as having messy black hair, in the film his hair is very dark brown and not particularly messy.
* Ron is described as tall and lanky, while Fred and George are shorter. Actor Rupert Grint is not tall and lanky in this initial film, while the two actors cast for Fred and George (James and Oliver Phelps) are. Also, Ron is supposed to have blue eyes, but Rupert has green. Ron in the book is also described as having big hands and feet, as well as a long nose; actor Rupert Grint has a regular sized nose and hands.
* Petunia Dursley has blonde hair in the book, but the actress in the film has dark brown hair.
* 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.
* Dudley Dursley is described to have had blonde hair in the books, while the actor has brown hair.

The Blu-Ray edition of *Philosopher's Stone* includes commentary from director Chris Columbus that reveals that the final scene of the film -- where Harry, Hermione and Ron depart on the *Hogwarts Express* -- was the first scene shot. As such, some changes in Harry and Hermione's physical appearance can be seen. Emma Watson was initially fitted with prosthetic teeth to make her look more like the book version of Hermione, but this was abandoned as impractical after the first scene was shot. Columbus says editing made the buck teeth less obvious, but they are still visible during a brief bit of dialogue. Actor Radcliffe, meanwhile, was fitted with green contact lenses which are clearly visible in close-ups, but they weren't used after this first day of shooting because they irritated Radcliffe's eyes.

### 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 ***Dursley***s. 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 giving him ***Dudley'***s ***extra bedroom*** because they were so merciful.
	+ On a related note, the film implies that the Dursleys' giving Harry Dudley's old bedroom occurred after his first year of Hogwarts, when he actually was given the bedroom right before Harry's new schoolyear in the previous book, in an attempt to dissuade the acceptance letters to Hogwarts addressed to Harry.
* 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.
* 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 on Harry's window 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. Ron doesn't say this in the book as Harry's birthday was the same day the Masons visited. It should be mentioned that in the film the Weasleys gets Harry out the same evening, while in the book they saved him from the Dursleys early in the morning, next day.
* 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 forgets Hedwig, but he gets to her just in time. In the film, Harry doesn't forget anything.
* 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 ***Flying Ford Anglia*** the Weasley brothers suggest that Dobby could be an untrustworthy servant of the Malfoys. 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 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 under-age magic is unnoticed. Though it is revealed in one of the following books that the Ministry of Magic only knows *where* there is used magic and not *who* it is that is using magic. (This explains why Harry is believed to be the one to perform the levitating spell on the pudding though it is Dobby. Also this could explain why Hermione didn't get a letter on the Hogwarts Express in the previous film; too many students and pre-students, plus two adults.)
* 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 in the film. 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 it 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 duckies.
* The scene where Harry and Ron go to Gringotts to get money is omitted from the film.

### 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.
	+ 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 Harry finds this 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.
* Howler bursts into flames in the book but rips itself into shreds in the film, with a *grrr*-sound.
* 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.
* Defence Against the Dark Arts shows both Hufflepuffs (Justin Finch-Fletchley and Susan Bones, for example) and Slytherins (Malfoy, Crabbe, and Goyle) 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, shower the back row with broken glass. The rest proceeded to wreck the classroom more effectively than a rampaging rhino, grab ink bottles and spray the class with them, shred books and papers, tear pictures from the walls, up end the waste basket, grab bags and books and throw them out of the smashed window; within minutes, half the class was sheltering under desks and Neville was swinging from the iron chandelier in the ceiling, half the students hide under desks, then the bell rings and everyone leaves. In the film, the chaos consists of book throwing, book page tearing and Neville hung 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 wand out the 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 his 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.
	+ In the novel, Harry, Ron 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 trio 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 sends none of them back into their cage.
* ***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 later explained the definition 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 says in the book. Ron only responds to it with only two words, 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 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 and Hermione are spoken to by the teachers in Gilderoy Lockhart's office. In the film, they are spoken to in the corridor where the attack happened.
* Mention of Filch being a Squib is omitted. However, very oddly, the term is mentioned in the Danish version of the subtitles; calling him *Mr Squib*, although with the Danish term.
* 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 writing on the wall is written in blood. The book, however, states that message is simply written in red paint.
* Because of the scene with Harry first hearing the Basilisk being moved to during his detention session with Gilderoy Lockhart instead of while heading back from the Deathday Party for Nearly-Headless Nick, the teachers' interrogation of Harry, Ron and Hermione was altered:
	+ Snape, when talking to Dumbledore about how perhaps the three students simply were present at the wrong place at the wrong time, implied that he viewed Harry in particular as a suspect due to his being absent during dinner, with Lockhart admitting that Harry's absence was actually his own fault, because he had unintentionally had Harry stay behind beyond the intended time period for detention, with Hermione then explaining to Snape that they were absent because they noticed that he was absent and tried to search for him, and was about to mention that he said he heard the Basilisk's voice before trailing off, causing Harry to lie and say that he told her he wasn't hungry.

### 10. The Rogue Bludger

* In the book, to borrow the ***Moste Potente Potions*** book from the library, which had the recipe for the ***Polyjuice Potion***, Hermione had to get a note from Gilderoy 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 were in the lead via 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 was 90-30, before Gryffindor received 150 points and 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 Quidditch 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 crashes 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, whereas is the books, it is never specified if he takes sides.
* In the book, when Harry is in the hospital wing following the Quidditch match, Ron, Hermione and Madam Pomfrey are the only people there when he takes the Skele-Gro, the rest of the team come in later and Madam Pomfrey shouts at them to get out. In the film however, the entire team plus Ron and Hermione come with him, and Madam Pomfrey tells them to get out of her way, not to get out of the Hospital Wing.

### 11. The Duelling Club

* The scene in which Harry, Ron, and Hermione cause a disturbance in Potions class to steal ingredients from Professor Snape was omitted. This caused a continuity error for *The Film Ad of Harry Potter and the Goblet Of Fire* where Snape accused 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 Jnr 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, 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 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. Also the games explains what he says.
* 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 Professor 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 that idea. Everte Statum was also not mentioned in the book but was used in the film.
* 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 I?'.
* In the book, the petrified Nearly Headless Nick is floating horizontally and is black. In the film, he is floating vertically and remains white.

### 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 colours at all.
* The scene in the Great Hall during the Christmas Feast, Hermione simply says that she got Millicent Bulstrode's hair off her robes. The novel, however, depicts her and Millicent in the Duelling club where Millicent is head-locking Hermione, and she happens to find black hair on her robes.
* 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 and Ron run past them as their transformation is in the middle of wearing off instead of pounding while still in the cupboard.
* In the film, Ron and Harry wear slytherin robes from Crabbe and Goyle, but in the books Hermione stole bigger size robes from the laundry, because in the books all robes are plain black and have no house colours.
* In the novel, the potion is in one of the stalls and when the trio 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 trio drink beside that same sink and only Ron and Hermione run into cubicles when they feel they're gonna 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 and Ron's voices don't change when they become Crabbe and Goyle, forcing them to imitate these 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 Jnr's usage of the Polyjuice Potion in *The Film Ad of Harry Potter and the Goblet Of Fire* (film) 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 Harry Potter and the Deathly Hallows: Part 1 / the first half of Harry Potter and the Deathly Hallows when Hermione, Ron, and others take the potion to transform into Harry, and Hermione remarks that Harry's eyesight is really bad.
* When looking for the slytherin common room, Ron asks Penelope Clearwater for directions. She doesn't help, as she's a ravenclaw. This is omitted from the film.
* During the Slytherin Common Room scene, there are some parts of the book which are omitted from the film, like:
	+ Draco showing Goyle/Harry and Crabbe/Ron 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 Muggle-borns (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 prison 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 pure-bloods 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, 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 Ron sees Harry's scar reappearing (which didn't happen in the book) and Harry seeing Ron's hair growing red again and whispering 'Scar' (Ron) and 'Hair' (Harry).
* 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's), Harry shakes his head and Draco puts the package in his school robe pocket, then a few seconds before Harry and Ron realise that they're about to turn back to their normal selves, Draco unwraps the package and after Harry's scar reappears and Ron's hair starts turning back to red, Draco is seen to having 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 Gilderoy 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, but in the film, Minerva McGonagall explains it to the students during a Transfiguration class as Professor Binns is not in the film. In the game, Professor Flitwick explains it during a Charms lesson.
* The Valentine's Day breakfast in the Great Hall which was arranged by Professor Lockhart is omitted.
* The scene when Harry gets his Valentine and Draco Malfoy tries to steal Tom 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 50 years before, 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 talks to Tom Riddle about Hogwarts closing. In the film, Dumbledore talks to Tom 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.

### 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 and Harry 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.
* **Possible Explanation:** Though Ginny did seem uneasy as if it is her fault, in the book she is 'bullied' into taking a dose of Pepperup Potion by Percy. In the film this is omitted, along with the fact that she didn't even notice Harry in the book, while in the film she had said 'Mummy, have you seen my jumper?', and Mrs Weasley responded with 'Yes dear, it was on the cat.' Then, when Ginny sees Harry, he says 'Hello' and she turns and hurries off.
* 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, 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 protecting 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 and Ron didn't see any spiders until one day in Herbology when Harry points them out to Ron. 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 Minister, Harry and Ron see spiders crawling along Hagrid's window and follow them into the Forbidden Forest.
* In the book, Ron (reluctantly) 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 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 Harry and Ron find the Ford Anglia, Harry tells Ron 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, when McGonagall and the other teachers volunteer Lockhart to fight the Basilisk, the teachers are collected in the ***Staffroom*** with Harry and Ron 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 Harry and Ron 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 and unlike in the book, the second message is seen on-screen in the film.
* In the book, when Harry and Ron 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 and Ron point theirs at his face.
	+ Also, the book has Gilderoy 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 and Ron jump into the cavernous pit 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, Ginny, and a recently-amnesiac Gilderoy Lockhart leave the chamber, where she 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 and Lockhart, but in the film, the tunnel was only one small room and had the entrance to the Chamber right before Harry, Ron 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 allowing 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).
* In the book, 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. Rowling later reveals in *Harry Potter Page to Screen: The Complete Filmmaking Journey*, that the Chamber is flooded and the rest of the statue below his head is submerged beneath the water (which 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, 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, 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; and in the film, there were two lines of giant statues of snakes' heads where the pillars were in the book).
* 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.
* 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 novel, when Harry and Ginny find Ron and Lockhart, Lockhart (having lost his memory) says 'Hello', that the chamber is an odd sort of place and asks if the three 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 who he is to which he replies 'Um... Ron Weasley.' and Lockhart responds 'Really? And who am I?' then Ron 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. Then Lockhart picks up a stone, gives it a short throw then asks Ron if he lives in the Chamber (and 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 books states that the journey ends in Moaning Myrtle's bathroom, 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 offscreen.

### 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, with Dumbledore also giving a veiled threat to Lucius in response to this as well as his forcing the board of directors to fire Dumbledore. In the film, Harry's accusation occurs after Lucius leaves, 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 both Harry and Ron in the book upon revealing that she had been cured. In the film, she only hugs Harry, 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 desired 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.