Continuity mistake: When the Cook's body falls out of the freezer on Mr. Green, he is pushed onto the floor. In the next shot, he is standing back up again. (00:33:20)
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 beginning when Col Mustard shows up, the butler shows him to the library, you can see that door to the library is open. When the scene shifts Wadsworth is opening the door. (00:05:30)
Continuity mistake: When Professor Plumb picks up Ms Scarlett on the roadside, they drive away in his black car. Moments later they arrive at the mansion in her scarlet colored car.
Suggested correction: First, Professor Plum doesn't have a black car. But you can tell that's it's Plum's car when they arrive because of the paneling and the rooftop. And it's not red, it's purplish (a plum color).