Character mistake: Hicox uses the word "momentarily" in the American sense of "in a moment". In British English it means only "for a moment". An educated Englishman in the 1940s would never have used the word in the American sense.
Factual error: Although Dieter Hellstrom is a Gestapo Major, he has the SS runes on his uniform instead of a blank square.
Suggested correction: Nowhere in the movie is he said to be a Gestapo Major. He is SS. Even if he was part of the Gestapo, he could still be an SS officer, as the Gestapo fell under the SS and RSHA.
Continuity mistake: When Hans Landa first approaches Bridget von Hammersmark in the theater, he is shown to be walking right up to her, as evidenced by the shot of his right foot being shown to be mere inches away from her left leg. When the shot changes to a medium shot of von Hammersmark saying "Colonel Landa, it's been years," Landa is suddenly out of shot, whereas the proximity of his feet to von Hammersmark's suggests he should have been visible in the medium shot. (01:51:10)
Continuity mistake: When Shoshanna meets Zoller, there's a strand of hair falling by her left cheek which appears or disappears depending on the angle focusing.