Continuity mistake: During the opening sequence, a bug flies down from the ceiling and crawls on Hans's glass. The angle changes and the bug is gone.
Continuity mistake: When Hellstrom toasts for a thousand-year German Reich, the position of his head and glass changes between shots.
Continuity mistake: When Hicox blows his cover, he raises three fingers and looks at Eric. In the next shot, Hicox is still looking at Dieter Hellstrom.
Continuity mistake: When Landa arrives at the property of Pierre LaPadite, he teleports in front of the hanging clothes between shots.
Continuity mistake: After Shosanna switches projectors on the visual cue from the film, the movie cuts to Marcel standing behind the screen smoking a cigarette. The camera pulls back from behind him showing a large billow of smoke rising from his face and he lifts his right arm up to his cigarette. But then the camera cuts to an overhead view, and suddenly his arm is down and the smoke is gone.
Continuity mistake: When Donowitz and Ulmer walk into the theater, they see Joseph Goebbels and his mistress in the box above them, to their right. They would be looking to their right to watch the movie. Later, during the movie, Goebbels, Hitler, the mistress and Zoller are looking to their left to watch the movie, so they would have to be in the box on the opposite side of the theater, where Martin Bormann was shown.
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.
Chosen answer: It is explained shortly afterwards that a real German would hold up his thumb, index and middle fingers to indicate three. Since, the major already suspects the Captain of being a spy, holding up his index, middle and ring fingers to indicate three confirms this.
Xofer