Audio problem: After Moose Matson is shot in the cop and car chase, Moose Matson, says, "Pull over, will ya?," but his mouth isn't moving.
Audio problem: When Daniel is on top of the tree house, his screams don't always match up to his mouth. (01:23:20)
Audio problem: Simone's scream at the end of her game is the same as one used earlier in the scene. (00:06:00)
Audio problem: In the scene just before the engineer falls from the train, all the main characters are gathered in the governor's car. Charles Bronson is pouring alcohol from a decanter. The "glug, glug" sound of pouring begins before the actual pouring starts.
Audio problem: When Dina says to Ryan that she didn't love Brad, just him, there is one point where she says, "No, I never did." When she does, her mouth does match up for the word "No" but not for the rest. (00:06:05)
Audio problem: When Frank says "Stay away from it!" whilst trying to shoot the truck during the chase sequence towards the end of the film, his mouth doesn't move.
Audio problem: When Deacon is talking to the cop's brother's corpse, he says "you're not talking to me now?" and his lips aren't moving. And moments later, he says "what? You don't want to?" And "you don't talk because..." Same things, his lips don't move.
Audio problem: When Niko is going to get the key for somewhere for Zoe to hide and then Zoe disappears he says "Zoe"? When he says it his mouth does not move but once he finishes saying it that's when his mouth moves.
Audio problem: The helicopter appears in front of the window (like, a few feet away) of the command deck of a ship in the middle of the ocean, with the ship being in full alert and with guards all around the premises but who all somehow missed its deafening arrival. (01:35:50)
Audio problem: When Armedeo and Estefania are ready to leave in the car, George stands in the driveway with a gun aimed at Estefania. Armedao gets out of the car, but the car's ignition goes off without Armedeo doing it.
Audio problem: When we see a close up of the LP playing on the gramophone, you can occasionally see the needle is not actually touching the LP but sound is still heard.
Audio problem: The chef finally gets the bright idea to fire his hunting rifle at Morgan's fleeing vehicle. In a previous scene he was grabbing ammunition for his rifle, and he also loaded it. The rounds appeared to be high power rifle ammo, probably in the 7mm Remington magnum or .30-06 range, very common hunting rounds. When he fires his rifle it sounds quieter than a suppressed shot, however he has no suppressor on the muzzle end of his weapon. (01:09:20)
Audio problem: In the opening scene, when Christian asks young Elise "How did you know that?!" after the talks about the man who was just executed, his mouth isn't moving. (True, he's out of focus in the background, but he's not speaking).
Audio problem: After Harlan knocks over the Go board, Marta says "I'm done with you." When she says that, which is when she puts the two vials on the table, her mouth isn't moving.
Audio problem: When the commissioner gets to the station at the beginning of the movie, a trans greets him, but their mouth does not move when they talk. (00:04:30)
Audio problem: During the final test, at one point Marcus says "Shoot this piece of s**t Ezekiel, now." In the first shot, it's clear he's saying something entirely different as his mouth movements don't match the dialogue. The scene then cuts to a closeup mid-line, and the closeup does match... but the first shot doesn't match in the slightest.
Audio problem: When the saxophonist talks to Eddie (Albert Finney) before joining his band, which has already started playing, the saxophone can be heard although the player has not yet joined them on stage.
Audio problem: Katherine visits Poirot at the field hospital; the opening line has a loud gulping, most likely dubbed, and then Branagh's voice says "I asked you...not to come" with the second part of the sentence added in dub; his lips don't move. (00:05:45)
Audio problem: When the RV starts up and drives to the TV spot after the initial greeting from the manager, the engine noise is a gasoline engine, when it should be a diesel noise, as it's a diesel pusher. (00:07:00)
Audio problem: When Bart is looking through a magazine and starts to rip a page out, the whole page is lifted and obviously already loose; Bart sets it down to look like he is tearing it out, and sound effects are added to make it appear he really is ripping out the page, but the sounds don't really match his motions. (00:31:20)