Audio problem: In the scene where Alfred is stitching up Bruce, Bruce says "I wanted to inspire people." As he says "people" the shot changes and his lips aren't moving, but the audio track continues.
Audio problem: When the Statue of Liberty's head strikes the top of a distant building before landing in the street, sight and sound are simultaneous. There should have been an audible lag in the sound due to the speed of sound being only about 1000 feet per second. The absence of this lag would be acceptable in most movies but is inconsistent with the amateur home movie theme of Cloverfield.
Audio problem: In the scene when he goes back to his home and finds his dad on the floor, he walks into the house and you can see Family Guy playing on the tv and hear it very quietly. Unfortuanately, the audio is coming from a completely different scene in the episode than the video. (You can see Lois is in the zoo, which comes from the beginning of the episode, yet the conversation you can hear is when they are sat in the kitchen towards the end of the episode.)
Audio problem: When Wesley first walks into the textile factory and sees Sloane talking to a worker, the first shot of Sloane shows his mouth moving and you hear him talking. In the very next close up shot of Sloane, you still hear his voice, but his lips aren't moving. He just turns his head towards the worker, then away.
Audio problem: The day after Operation Mardonius, when the first set of bombs explodes you first see the explosion and then hear it after a second, then as the last bombs explode you both see and hear the sound at the same time.
Audio problem: In the scene where James "forgot [his] gloves down there", the sound from the detonation just before that is incorrectly in sync with the explosion. Given that they are a distance away from the blast itself, what should happen is you see the blast first, then hear it say about a second or more later (based on the estimated distance). (00:48:50)
Audio problem: At the beginning, when Professor Broom and the young Hellboy are spending Christmas Eve at a military base in New Mexico, Broom insists that Hellboy go to bed, while Hellboy insists that Broom first tell a bedtime story: "Just one, and then I'll go to bed right away, I promise!" Which is an overdub (one of several in this scene). More than once, the young Hellboy's mouth visibly says something very different than is heard in the audio.
Audio problem: During the final scene, when Mad Dog says "Evening girls! You're looking well!" and "Ooo! It's a fine night to be me!" his mouth isn't moving. They almost get away with it because his face is partially obscured for the first line, but you can still see that he isn't actually speaking.
Audio problem: When Ami first gets her machine-gun arm and is blasting away at the teenage Ninjas (in red), when she blows a hole through the stomach of the second Ninja, you can hear one extra gun-shot after Ami stops firing her gun.
Audio problem: When the general asks how Blonsky was doing, he doesn't open his mouth. (01:07:40)