Corrected entry: When the lights are turned out in the beginning by the "butler" there is a series of sounds (thud, gasp, gunshot, scream). Since the only thing that happens when the lights are out is that Professor Plum fires the gun (whether someone grabbed it or not), the first sounds shouldn't be there.
Corrected entry: After the candlestick drops from the ledge above the bathroom, it mysteriously vanishes for the rest of the movie.
Corrected entry: When they are searching the house, look at the window at the top of the stairs after the lightning strikes, you can see a person's face in it. (00:47:10)
Corrected entry: Near the end of the movie (the Miss Scarlet did it ending) when the singing telegram girl is dropped on the floor in the study, the sofa has no one on it. Everyone is seen leaving the study and goes back to the hall to continue hearing Wadsworth's who-dun-it explanation. During this scene, in the background, the cook's body is back on the sofa in the study as she was earlier in the evening.
Corrected entry: At the beginning of the film, Wadsworth approaches the house and feeds the growling dogs outside. Apparently, from the expression on his face combined with his slowed pace, Wadsworth steps in the dog's droppings before entering the house. He then proceeds to scrape the bottom of his shoe on a pot in front of the door. The next shot is a bit wider and shows the ground where the supposed dog droppings were, however, there are none to be found. Surely some would have remained. This is fairly important considering the smell that lingers around Wadsworth makes up a greater part of the beginning of the film.
Corrected entry: How much does Wadsworth forget when he reenacts the events of the evening? He completely misses the part where he was on the phone in the library and the cop was being shown the fake 'party'. During this sequence Yvette disappears (When they gather in the Hall afterward it looks like she comes from the Kitchen). He seems to be a pretty good judge of what everyone is up to when his back is turned, so why does he leave this part out. The gun could have been stolen during this time, or any of the other weapons.
Corrected entry: When they lock the weapons up they forget about the candlestick (which, as mentioned, mysteriously disappears) and leave the knife sticking out of the cook's back. Wadsworth and the others wouldn't know how many times each weapon would be used so why only lock up the four that haven't been used yet.
Corrected entry: At the point where Mrs White smashes her wine glass against the fireplace, you can hear the smash but see at the bottom of the screen that the glass is still whole.
Corrected entry: At the end of the movie, in the first ending, Yvette supposedly killed the cook whose scream wasn't heard because of Mrs. Peacock screaming. However, Yvette then returns to the library and screams, and when they all run to her, she says she screamed because the brandy was poisoned, but when Prof. Plum said that, she was supposedly in the kitchen killing the cook. How could she have heard him say it?
Corrected entry: Just before the chandelier falls to the ground, Yvette and the butler turn away from it, like they knew it was going to happen right before it did. (00:55:34)
Corrected entry: When Pr. Plum says that the brandy was poisoned, Mrs. Peacock drops her glass. A few shots later, it shows that the glass broke. At the end of the movie, Wadsworth is explaining what happened. He was doing the part when Peacock was screaming. When Wadsworth dropped the glass, it made a thumping noise, meaning it didn't break. Why did Mrs. Peacock's glass break, but Wadsworth's didn't?
Corrected entry: When the police officer enters the house, there is broken glass all over the floor. He enters the library, then exits it seconds later. By then, all the glass has been cleaned up.
Corrected entry: In the beginning of the movie, when Yvette is dancing in the study while cleaning glasses before the guests arrive, she is dancing to the record player, which is playing "Shake, Rattle n' Roll". But in the end, when the cop shows up and they are trying to pretend they are making out, they are listening to 'Sha-Boom". When did they have time to change the record?
Corrected entry: The chandelier is shattered, then they clean it up. In the last scene with Mrs. Scarlet as the killer, he shoots down the chandelier AGAIN. I don't think they had the time to glue the billions of pieces back together and hang it back up.
Corrected entry: After Wadsworth comes into the mansion in the opening scene, we are informed that the movie is set in New England in 1954. Later, at the end of the movie, in the third of the trilogy endings, Wadsworth reveals Miss Scarlet as one of the killers. She then exclaims, "Who are you, Perry Mason?" Sadly, Perry Mason did not originate before 1954. (01:30:29)
Corrected entry: The house has two guard dogs that bark when Mr. Body tries to escape, but then they just stop barking. Guard dogs are supposed to bark when people come. They don't when J. Edgar Hoover comes and you don't hear them when the singing telegram girl gets shot. Guard dogs would be heard.