Revealing mistake: To save money during the beach picnic scene, Welles used stock footage from King Kong (1933) for the jungle background. You can quite clearly see pterodactyls flying in the background (confirmed on DVD commentary).
Citizen Kane (1941)
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Directed by: Orson Welles
Starring: Joseph Cotten, Orson Welles, Agnes Moorehead, Dorothy Comingore
Continuity mistake: When Kane and Susan are speaking in their mansion, Susan is busying herself with jigsaw puzzles. The wide shot shows the jigsaw puzzle almost completed, but Susan's close-up shows the jigsaw puzzle in pieces.
Charles Foster Kane: You know, Mr. Bernstein, if I hadn't been very rich, I might have been a really great man.
Trivia: Steven Spielberg bought the famous 'Rosebud' prop at an auction in 1982 for $60,500. When Orson Welles heard about this, it was reported that his reaction was, 'I thought we burned it.'