The story for Hare Rama Hare Krishna actually came to Dev Anand's mind when he saw hippies and their fallen values in Kathmandu where he was on a visit after the protests against his previous Prem Pujari in Calcutta. He was low in spirits because his film had been opposed and some had burnt Prem Pujari's posters. But the life of hippies re ignited a story in Dev's mind to be made into a film.
This was Dev Anand's perhaps best directorial effort. The film was a blockbuster super hit at the box office and Zeenat Aman as Dev's sister made a tremendous impact.
This film was Dev Anand's call to the nation to keep up their moral values.
It is about a Montereal based Indian family and the brother's role is a very affectionate one for his sister. But the parents quarrel and separate leaving Prashant(Dev) with mother and Jasbir(Zeenat) with father. She is repeatedly told that her mother and brother are dead and she eventually believes that she will never see Prashant again.
She is ill treated by her step mother and she runs away from home. Dev grows up to be a pilot and he learns that Jasbir is in Kathmandu with certain hippies.
To reunite with his sister, Dev travels to Kathmandu and meets Shanti(Mumtaz) who was to later marry him and also Janice who in reality is Jasbir with a new name and new identity. She has forgotten her childhood and Dev too.
Dev has to get his sister back amongst all other happenings which include his being suspected as a thief in Kathmandu and the people are after his life.
This was a story well directed and acted-both by Dev Anand. We see more of Zeenat Aman than of Mumtaz. But the music by Rahul Dev Burman was well composed. Dev had first offered the music to be composed by Sachin Dev Burman but Burman Da did not want Dev to do the film. He was very close to Dev and his earlier film Prem Pujari, though was good, but had been opposed in Calcutta. Burman Da wanted Dev to try a lighter subject as he thought hippie cultist film might reignite people's anger against Dev. But Dev continued with the film reassuring Burman Da and the film was indeed a success.
R D Burman had Asha Bhosle sing the award winning Dum Maro Dum. Kanchi re Kanchi re was another good number.
Overall it is a good film.

This film is terrible. I was really looking forward to it, as I thought "Lantana" was great.
The following review may contain *spoilers*
*****
First, the good things: it looks great, some of the performances are OK. The bad things are everything else about it.
The story, as you possibly know, is about some blokes who go fishing and discover a body, with the twist that they find it on Friday but continue fishing and finally report it on Sunday when they get back into mobile (cell phone) range. However the film takes it's time (boy does it take its time) getting to this central event.
Of the ensemble of characters (about a dozen), not one seems to like another one (which is, I suppose, consistent, because they are all unlikable). I was extremely frustrated by the failure to adequately explain how the characters are related, and it was not until near the end of the movie that I could vaguely construct the family tree.
It's hard to think of a film us unrelentingly grim, which is a failure in the structure of the story, as the character's lives seem just as bad before the fishing trip as after. Once you've set the bar so high, it's hard to up-it short of everyone committing suicide.
There are silly lapses in logic. The killer dumps the body in the lake, and then it somehow drifts miles upstream into the mountains. The fishermen walk out Sunday morning, but for some reason Byrne gets home late at night after his wife has gone to bed. Then first thing the next morning the cops bang on the door to get him to come down to the station. Um, they haven't heard of the telephone? Down at the station, the media know the whole story, less than 24 hours after they reported the body?
Totally missing from the story is the debate the blokes surely had after they find the body. This is a mystery - everyone asks them "how could you do that?" and the audience is asking the same question. (The debate about what to do with the body is the key scene in "Deliverance"). I know exactly what I'd do in their situation. Someone needs to walk out to the car, drive to mobile range, call the cops, wait, and them guide them back to the location. If the others wait at camp and fish, who cares?
A lot of all this just seems false. The only thing that rung true was that, as the girl was black, the local aboriginals seized on the fishermen's actions as racist - "wouldn't have done it if it was a white girl."
Throughout there is a curious indifference to who might have killed the girl (I think the subject is mentioned once), and there is no mystery, as the audience sees the killer in the opening scene.
So I'm sitting there simultaneously bored and confused, when there's a twist - not in the plot, but the theme. Suddenly it becomes about the quiet dignity of the bereaved aboriginals leading to a ludicrous ending with some incoherent stuff about black-white reconciliation. Huh?
This is Australian film "at its finest", according to The Age.