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.
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.
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.