Audio problem: When Carl gets on Lee's Ducati and revs the engine, the sound heard is from an inline four cylinder engine, not a 1100cc L-twin Ducati Hypermotard.
Audio problem: At the hospital, just before it cuts to Dr. Pincus answering, or rather not answering, the nurse's admittance questions, when a doctor asks about his charts as he says, "I appreciate it," his mouth is not in sync with the words. (00:09:45)
Audio problem: In the cornfield, after Rick has run Lance over in his truck, Rick gets out and walks towards Lance saying, "Get on your feet, you....!" Although the shot is shown upside-down it is quite plain that his lips are not moving. (00:33:50)
Audio problem: When we hear the one kid crying and Jenny gives them to John, you can tell the kid isn't really crying.
Audio problem: In part II, after Cohen has killed the High Priest he sheaths his sword. You can see that he actually misses the scabbard, and slides his sword down the side of it, but the sound of the sword being sheathed can still be heard as the camera pans to Rincewind.
Audio problem: At the start of the movie, the soldiers switch on the lights on the vehicles. Each light has a sound effect to a massive spot light activating, when in reality they are just headlights and wouldn't make any kind of sound.
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: 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: 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: 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 Leela says "I'm saving my neck for a rich handsome Dracula!" whilst being ambushed by Vivo, her mouth doesn't match what she's saying at the end of the sentence. (01:01:10)
Audio problem: When Pavlov is speaking with the doctor, we hear him finishing a sentence with "say, a doctor, perhaps" but his motionless mouth and jaw show he isn't speaking at all in the side shot. (00:19:00)
Audio problem: When Augie is kneeling down, Sarah walks by and says to him "Hi Blupkin" but her mouth does not move. (00:25:30)
Audio problem: During the birthday sequence, the singer's voice is not in sync with his lips when he is seen on the background. He sings when there's only music sounding and no voice.
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)
Audio problem: When Mom goes to slap her kids after they fail to find Farnsworth, Fry and Leela, she slaps Walt but you don't hear it until she's halfway through slapping him. (00:47:30)