Continuity: In one of the first scenes in the study, Mr. Boddy hands each guest a weapon and then proceeds to turn out the lights. The room is thrown into complete darkness. Unfortunately, there is a roaring fire in the fireplace that would have illuminated the room enough for everyone to see what was going on.

Deliberate "mistake": The same footage of Ms. Scarlet screaming when the cook falls out of the freezer is used when Wadsworth falls out of the freezer. (Note the cigarette.)

Continuity: When a gloved hand tosses an envelope's contents into the fire, most of the papers miss the fire completely.

Audio problem: When they are putting the Cook's body on the sofa, Wadsworth walks by in the background and says "Careful, don't get blood on the sofa" however his mouth doesn't move.

Visible crew/equipment: Towards the end of the film, when the butler is explaining 'whodunit', as he stands at the front door, quite clearly at the top of the screen a microphone can be seen following him back and forth.

Factual error: When the evangelist first enters the mansion, Mrs. Peacock calls him a beatnik. However, the movie is set in 1954, and the word "beatnik" was not coined until 1958.

Revealing: In the study, when Wadsworth says that Mr. Boddy is the one that's blackmailing everyone, Colonel Mustard and Mr. Boddy get in a fight. Mr. Boddy pokes Colonel Mustard in the eyes. You can tell that he stops his fingers right in front of Mustard's eyes. Less than a second later, Colonel Mustard falls over.

Continuity: When everyone is searching upstairs and Miss Scarlet and Colonel Mustard start screaming, they all come running down. Yvette has on flat black shoes, but right after the running shot is over she is back in heels.

Revealing: In the hallway, the camera pulls back from the dining room towards the front door. The camera pulls back too far, and on the floor masking tape and a different type of wood can be seen, indicating where the set stops.

Revealing: After they find Mr. Boddy's body in the bathroom, Wadsworth starts shouting. A candlestick then falls and hits him on the head. Look at the candlestick when it falls: you can tell it was pulled by a string or something.

Continuity: When the Armageddon guy comes to the door, Mrs. Peacock slams the door in his face, and the flier he was holding flutters out of his hand and lands on the floor. In the next shot, the flier disappears.

Visible crew/equipment: After opening the doors to the lounge to let Col. Mustard and Miss Scarlet out Mrs. White says "How did you get in the doors were locked?" After this line, for the remainder of the scene, on the left side of the wall beside the chair the reflection of a crew member and the boom mic pole can be seen moving around.

Continuity: When they enter the kitchen to check on the cook, a pot on the stove disappears and reappears.

Other: When Mrs. White enters the house, she takes off a black and white cape so she now is wearing a light coat over her dress. There is a point at which she is about to take off the coat, and with the camera angle change, she has it in her hand.

Other: At the beginning of the movie Mrs Ho says "Dinner will be ready at 7:30". In one scene, way after dinner, when the house is being searched, we see Mrs White and Wadsworth each standing at two seperate doors, and Wadsworth asks, "Do you want me to go in with you?" You will see that the grandfather clock between the doors reads 7:05.

Continuity: After Mrs Peacock turns the lights back on in the study, she drops the dagger where she is standing, by the door. A few moments later when she is screaming about the 'poisoned' brandy, the dagger is no longer there. That area of the floor can be viewed as Mr Green is calming her down and the dagger is nowhere to be seen. This is explained in one ending, as Yvette crept in and stole the dagger in between time. However using the real ending (i.e. the one where the title card reads 'Here's how it REALLY happened') then this is a massive goof, particularly as Mrs Peacock is supposed to kill the cook with the dagger in a few moments time.

Continuity: After Mrs. Peacock says "Mmm, this is one of my favorite recipes" each time the camera angle changes at the table her fur boa changes from up to down for a few shots.

Audio problem: In the scene where everyone gangs up on Mr. Boddy, the audio doesn't match much of the action going on.

Revealing: A visible editing flaw occurs near the beginning, after they return from the Billiard Room with Yvette. While Mrs. White is saying her line to Wadsworth, "I think you had better explain," she starts to unbutton her overcoat. Next is a wide shot of the room that is supposed to be in real time, but Mrs. White's overcoat has already been removed, and she is getting ready to lay it on a chair. Everyone is paused on their marks as if the film was spliced at the exact moment the director yelled, "Action" and no one had moved yet.

Continuity: When Professor Plum turns over Mr. Boddy to see where he's apparently been shot, his eyes are closed. In a flashback sequence later in one of the endings (where Miss Scarlet and Yvette are revealed to be the killers), after Plum turns Mr. Boddy over, his eyes are open instead.