Continuity mistake: When Charlie and Valerie talk in the restaurant you see in the background behind Charlie the same waiter approach a lady and lean over her twice in exactly the same way within a few seconds.
Continuity mistake: When the police officer drives by the two cars of the orchid stealers they are in the shade. When he stops and looks back the sun is shining on the cars, also when he gets out and walks over.
Trivia: When this film was nominated for Best Adapted Screenplay at the 75th Academy Awards, the fictitious Donald Kaufman was nominated. This was the first time an Academy Award nomination was given to a fictional character.
Trivia: At the end, when Amelia is talking with Charlie, she is talking about Prague, which has a great puppet exhibit there...this is a tribute to the film Being John Malkovich, which was written by the writer of this film (Charlie Kaufman).