Character mistake: Breaking the news of war to the Sayers, Allnut tells them that the war is involving smaller nations like "Austria, Hungary, Belgium, Spain." Spain was not amongst the participants of WW1. (00:10:00)
The African Queen (1951)
1 character mistake
Directed by: John Huston
Starring: Humphrey Bogart, Katharine Hepburn, Robert Morley, Peter Bull
Revealing mistake: When the boat is supposedly surrounded by a swarm of flies, they're really just relatively few flies trapped between two panes of glass in front of the camera lens. Evidence: whenever the camera moves, the "swarm" moves with it against the background, and you can even see some of the insects walking on the surface of the glass.
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Trivia: Humphrey Bogart won his only Oscar for his performance as Charlie Allnut in this film.