There are several major differences between the book Fahrenheit 451 by Ray Bradbury and the movie Fahrenheit 451 directed by François Truffaut including the character of Clarisse, the book that sparks Montag's imagination, and the way the future is depicted in the setting.
Clarisse is a 16-year old girl in the novel and she dies in a hit-and-run accident. In the movie, she's 20, she's a teacher, she survives for the length of the film, and she ends up in a romantic relationship with Montag. Truffaut uses Clarisse more as a companion to Montag instead of a person whose company he briefly enjoys and whose death haunts him. In the movie, Clarisse also connects him to the book people, a group who each memorize a different book to preserve it.
In the movie, Montag gets the book Tales of Mystery and Imagination by Edgar Allan Poe. In the novel, he gets Ecclesiastes, a book of The Bible.
The way the future is depicted in the novel is very futuristic with a lot of science fiction elements....
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