Audio problem: Just after Dynamo kills Weiss, the next shot shows Dynamo approaching the camera. You can see Dynamos lips moving, and he's speaking, but you can't hear anything.
Audio problem: When E. Johnson and Sam are hiding behind a pile of tyres, spying on Lester, after Lester's group has pushed the caravan off the cliff, Johnson gets up and says "We're gonna take a little detour," but her mouth is shut. (00:32:00)
Audio problem: The keyboard Kevin gets from the music shop seems to have an interesting trait, in that the high notes are on the left. This must either be bad "audio dubbing" or something to do with the shot perhaps being reversed, although I doubt this. It's most likely a post-production audio error as very very few keyboards or pianos are configured in this way.
Audio problem: The radar operator (making the sounds of a garbled intercom) is laughing through his next line "I'm having trouble with the radar, Sir." (After/when Dark Helmet throws the intercom across the control panel). (00:21:45)
Audio problem: On the moon, Superman smashes Nuclear Man's head against his knee. The clonk is heard before the hit (even forgetting that sound can't be heard on the moon).
Audio problem: When Lord Crumb says "Once the Fast Food authorities have checked the samples..." his mouth movements are way out of sync with the audio. (00:45:50)
Audio problem: After Dutch has fired the rocket at the Predator standing on the log, the Predator shoots several times. Then you can hear it shoot one more time, but you can't see any blast coming from it. (01:24:35)
Audio problem: When trying to steel the BET, Serpentor fllies in close and Duke grabs onto his glider. The sounds of TIE Fighters are used for Serpentor's glider. You can even hear Darth Vader breathing for a moment. (00:15:45)
Audio problem: At the end of the movie where Dick Jones is falling from the OCP building. At the end of the shot you can hear the splat sound. But he's not near the ground yet. He is still seen up in the air. (01:36:00)
Audio problem: After the incident in the flight chamber with Goliath at the film's climax, Jimmy turns to Teri and says "let's get the hell out of here." However, the audio does not his mouth movement, as he was saying "let's get the fuck out of here." (01:31:40)