- Orson Welles didn't want to film various sewer scenes and left before the sewer sequence could be completed. The shot near the end in which Harry Lime's hands reach for the sewer grate are actually the hands of director Carol Reed.
- Orson Welles starred in a radio series ("The Lives of Harry Lime," 1951-52) based on the early adventures of his character in The Third Man.
- 'Cotten, Joseph' re-created his role in the Lux Radio production of "The Third Man" with Evelyn Keyes playing Valli's role. Orson Welles was not in this radio play.
- This film tops the "BFI 100," a list of a hundred of "the best British films ever" compiled by the British Film Institute (in 1999/2000).
- 'Greene, Graham' based the character of Harry Lime on British double agent Kim Philby, who was Greene's superior in the British Secret Intelligence Service.
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