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.
The African Queen (1951)
Ending / spoiler
Directed by: John Huston
Starring: Humphrey Bogart, Katharine Hepburn, Robert Morley, Peter Bull
The African Queen sinks and Rosie and Charlie fail in their attempt to blow up the enemy German ship. They are captured and taken aboard the ship. Just before they are to be executed, they ask the captain to marry them first. He agrees and performs the ceremony. Meanwhile, the sunken African Queen partially surfaces with the torpedoes still strapped to the hull. The Queen rams into the German ship, and it explodes. Charlie and Rosie are able to jump off just before the explosion and safely swim to shore.
More mistakes in The African Queen
Rose Sayer: Dear Lord, We've come to the end of our journey, and in a little while we'll stand before you. I pray for you to be merciful. Judge us not for our weaknesses, but for our love and open the doors of heaven for Charlie and me.
Trivia: Humphrey Bogart won his only Oscar for his performance as Charlie Allnut in this film.