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?
Question: In the "Real Ending", if Mr. Green was actually an undercover FBI agent, who was the fake informant that gave fake info to Wadsworth to make him invite Mr.Green to the party in the first place? Wouldn't Wadsworth have thought it was strange that that was only informant that didn't show up to the mansion that night?
Answer: All the informants showed up. They were the murder victims. The Cook, Yvette the Maid, the Policeman, the Singing telegram girl, the Stranded Motorist and Mr. Boody. Each of them were the informants to the guests.
The questioner is asking why there isn't an informant for Mr. Green. The Cook informed on Peacock, Yvette on White, Policeman on Scarlet, Singing Telegram on Plum, Motorist on Mustard. "Mr. Body" wasn't an informant, he was the real Mr. Body's blackmailed butler.
Corrected entry: Yvette the maid is French but when she sneaks into the Billiard Room and is speaking with her killer her French accent briefly disappears.
Correction: This is not a mistake. It is a plot point. She is not the maid. She is working undercover for the killer.
That only works in continuity with the first ending we are shown. For the other two endings, it is still an error.
Even in the other two versions, it could easily just be part of Yvette's cache as a sex worker to pretend to be a sexy French maid.
Continuity mistake: The Singing Telegram's body position changes when everyone finds her. (01:04:45)
Suggested correction: She was shot, not switched off. She likely didn't die instantly. It's perfectly reasonable that she would move her arm as she was dying.
She died instantly, that is why she collapsed instantly. I am still wondering why they didn't make it look like a real shot, and have blood around the area she was shot at? They made it look as though she was wearing a bulletproof vest and was shot. You can see silver, no blood.
Other mistake: In one ending, Mrs. White is responsible for Yvette's death, yet when Yvette rushes downstairs to meet her killer, Mrs. White is still heard screaming upstairs.
Suggested correction: If Mrs. White was indeed the killer, she could have followed Yvette, then gone into the room where they meet before her. The screaming has stopped before Yvette actually gets inside the room.
That would be impossible. There is no way that Mrs. White could have murdered Yvette because Yvette is seen running down the stairs while Mrs. White is still heard screaming upstairs. Add to the fact that the power to the house had been shut off leaving it in complete darkness, Mrs. White had no way of seeing where she was going and would most likely keep bumping into things. Plus, when Yvette gets to the billiard room, the murderer is already inside waiting for her.
Suggested correction: Mrs. White is not screaming when Yvette is walking into the room (where she is killed) only while Yvette is running down the stairs. Yvette pauses for a brief moment to look into the dining room, then proceeds to the billiard room. There are many secret passageways in the home, and one upstairs could have led into the billiard-room.
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.
Correction: It's possible that they didn't think to lock up the others. We don't know per se that the characters are particularly smart so it's possible they just didn't think that anyone would take the knife out of the cook's back. After all, no one did actually take the knife out of the cook's back and use it again.
Exactly. It's not like the Candlestick couldn't have been re-used, but no one bothered to move it once it fell from the lintel.
Correction: Different room, different record player.
The making out scene to fool the cop happens quite a while after the guests arrive. Yvette could've changed it during dinner, one of the guests could've put it on when we were focused on Wadsworth chasing Mr. Boddy, One of the guests could've changed it when they were making up the room to fool the cop, any number of possibilities.