During their tumultous road trip from Wallbrook, in Cincinnati, to Los Angeles, Charlie and the kidnapped Raymond stop at a diner in a small town for breakfast. There, Raymond, who has a superhuman memory, recognizes the name of their waitress, Sally...
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Throughout the movie Raymond talks about "K-mart, 400 Oak Street." 400 Oak Street in Cincinnati, where the film is set, is actually the address of the Vernon Manor Hotel, which is where the cast of the film stayed during location shooting.