Continuity mistake: When Professor Plum says Mr. Boddy might have been poisoned with the brandy that Mrs. Peacock starting drinking, she screams and drops it simultaneously. In the flashback, Mrs. Peacock starts screaming violently, and then dropped it.
Continuity mistake: When Professor Plum is sitting on the couch between the corpses of the Mr. Boddy and the Cook, Mr. Boddy is lying in Professor Plum's arm, in the next shot when Colonel Mustard, goes to close his eyes, he is now lying next to the arm of the sofa.
Continuity mistake: In the "C" ending, the one in which everyone is partially guilty, when Mr Green lets the cops in and they run into the hall, the shot from behind the other guests shows them put their hands up as the cops surround them. When the camera angle then shifts to show them from the front, their hands are down.
Continuity mistake: When Professor Plum and Miss Scarlett enter the porch, the camera closes in on his hand touching her bum. But the following shot shows his arm at the center of her backside as she 'edges' away from him.
Continuity mistake: When Yvette serves Mrs. Peacock she says shark fin soup but then on 2 occasions later when Wadsworth is going back over how they did it he refers to the soup as a monkey brain, popular in Cantonese cuisine.
Suggested correction: There's actually 2 separate dishes the shark fin soup and then the monkey brains which is that white fluffy stuff they eat after the soup.
Continuity mistake: When the 1st chandelier fell, we see Peacock and White are standing near the front door. Scarlet then says "look!" Bringing everyone to look at the dead motorist in the study. Peacock and White are suddenly teleported to the study door behind Scarlet, even though they were quite far away with even a couple steps to climb down.