Character mistake: When Spade leaves Brigid in her hotel room, he says he will buzz her buzzer long-short-long-short, so she will know it's him. When he does return, he only buzzes long-short.
The Maltese Falcon (1941)
1 character mistake
Directed by: John Huston
Starring: Humphrey Bogart, Peter Lorre, Mary Astor, Gladys George
Continuity mistake: Kasper Gutman goes wild cutting the Maltese Falcon continuously with his knife, but in one of the inserted close-ups of him he's just standing there not doing anything. (01:28:40)
Tom: What is the Maltese Falcon made of, to make it so special?
Spade: The stuff that dreams are made of.