1. In the original script, Raymond was cheerful and friendly. But after reading the script for the first time, Dustin Hoffman successfully lobbied the screenwriter to turn him into an introverted autistic.
2. Raymond said that his underwear was bought from K-Mart on Oak and Burnett. This address is actually a hotel in Cincinnati called Vernon Manor Hotel. At the beginning of the movie, Charlie, Raymond and Susanna lived in this hotel.
3. The names on the two phone books that Raymond remembers, Martha and William Gertsergen, are the names of Dustin Hoffman's in-laws in real life.
4. Shortly after the movie started, when the lawyer read out his will to Charlie, he said: "I will definitely get the rose garden, I must have got the rose garden." This implies that Raymond will use it extensively in "definitely" () this word.
5. Jack Hoffman, the boy standing behind the cashier of the pancake shop, is the son of Dustin Hoffman.
6. In order to play this character image well, Dustin Hoffman spent a year living with autistic patients, observing and understanding their life habits and typical characteristics; at the same time, he also asked psychopathologists Consult, understand the psychological state of such patients and the cause of illness.
