- Screenwriter Herman J. Mankiewicz wrote the balance of the screenplay for this film from a hospital bed recovering from illness.
- The scene where Kane destroys Susan's room after she's left him was done on the first take. Director/star Orson Welles' hands were bleeding, and he is quoted as saying "I really felt it".
- Welles privately watched Stagecoach (1939) about 40 times while making this film.
- When asked by friends how Kane's last words would be known when he died alone, Welles reportedly stared for a long time before saying "Don't you ever tell anyone of this". See also the goofs entry.
- The producers ran the film across concrete to make the newsreel on Kane's death seem more authentic.
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