Corrected entry: Towards the end after Charlie and Rosie almost get eaten alive by flies on the river bank. They get steam up and go to the middle of the river. Charlie says, I'll throw out the anchor. He does and they start to relax and chat. However the scenery behind them is still moving.

The African Queen (1951)
1 corrected entry
Directed by: John Huston
Starring: Humphrey Bogart, Katharine Hepburn, Peter Bull, Robert Morley
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.
Rose Sayer: Mr. Allnut! Mr. Allnut, you may come in out of the rain.
Trivia: Humphrey Bogart won his only Oscar for his performance as Charlie Allnut in this film.
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Correction: The scene was shot on location, on an actual boat, and you can see the anchor is out. Either the anchor chain in still playing out or the boat can move to some degree in an arc around the anchor.