* AFIS100Years100Cheers: #63
* DuelingMovies: With ''Film/{{Twins}}''.
* MethodActing: Creator/DustinHoffman's portrayal of Raymond changed so much over the course of making the film that by the time the second half was filmed, they had to re-film the first half because Hoffman's portrayal had improved so much. Hoffman worked with Kim Peek for a while to try and understand him. Hoffman later suggested they let Kim interact with the public more via forums as he saw a big improvement with his social skills after only a few days of interacting with a stranger. Kim (with his father and caretaker) started doing conventions and because of this movie he was in high demand and very popular.
* RealLifeRelative: Creator/DustinHoffman's son Jake is the boy at the pancake counter.
* TheRedStapler: Creator/TomCruise's wearing Ray Bans boosted sales of that style 15%.
* ThrowItIn: On ''Oprah'', Creator/TomCruise and Creator/DustinHoffman said the "farting in the phone booth" bit was improvised when Hoffman actually passed gas while the scene was being filmed. Hoffman said it was his favorite scene ever.
* UnintentionalPeriodPiece: Definitely this trope, definitely this trope.
* WhatCouldHaveBeen:
** The script was originally written with real-life brothers Randy and Dennis Quaid in mind.
** Creator/DustinHoffman originally wanted Creator/BillMurray to play Charlie.
** Both Creator/JackNicholson and Creator/RobertDeNiro turned down the part of Raymond.
** Creator/StevenSpielberg was supposed to direct, but he had to drop out due to his commitment to ''Film/IndianaJonesAndTheLastCrusade''. He gave the notes he had made in preparation to Creator/BarryLevinson.
** Raymond was also originally written as a higher-functioning, extroverted autistic man. It was Hoffman who suggested making the character a more severe, introverted autistic, and they ran with it.
* WriteWhatYouKnow: Writer Barry Marrow based Raymond on a real life Autistic man he met. He admits that he took the man away from the institute and took him on a road trip.