* WhatCouldHaveBeen: Among other people envisioned for the role of Raymond: Creator/BillMurray! Just try to wrap your head around that.
** 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.