- Freddie Bartholomew was originally considered for the central dual role. Instead, real-life twins Billy Mauch and Bobby Mauch were hired.
- MGM bought the rights to Mark Twain's novel in 1935 for $100,000, but never filmed the story. Eventually, Warner Bros. secured the rights.
- The coronation scene was on a set that duplicated Westminster Abbey and took seven days to shoot.
- William Dieterle filled in as director when William Keighley got the flu. Similarly, photographer 'Barnes, George' took over as director of photography when Sol Polito fell ill.
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