Charlie is also shown rejecting Miss Kinnian's question if he was to marry her. Some similarities include the obvious same main idea and characters, though one doctor is male and one is female in the movie. Another would be the death of Algernon and the tests with Charlie.
Both had Charlie go through surgery and getting smarter, then dumber. To conclude, both the story and the book share many events, characters, and ideas, they also show differences from one another. The movie had the characters of a different gender than what you would expect when reading the story first. The movie director added in extra scenes that help portray the main story. Though the main idea of both were well thought out, there could have been a part in the movie that showed an alternative ending than the book, such as the operation becoming permanent or Charlie marrying Miss