Audio problem: In the mansion, the boys open a secret passage and fall through the floor. They scream after shining a flashlight on a skeleton. Eugene then can be heard whining that he wants to go home, but his mouth is not moving.
Audio problem: It's quite obvious that all of the grunts and sounds of terror that Ash makes while his hand is attacking him in the kitchen are dubbed. (00:28:45)
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 the band is playing, the drums are not in sync with what the drum players are playing. (00:05:55)
Audio problem: When Kirsty is flirty with Steve at dinner and he says "So lay down," the audio doesn't QUITE match his lip movements. (Several characters were redubbed with American accents in post. Presumably this is the reason for the inconsistency).