Audio problem: During the climax of the film, the maiden takes the stone from Galen and attempts to smash the amulet. Galen pulls the stone away and says "NO! He said I'd know the time". However, his lips do not match the words. He appears to say "NO! It is not yet time!"
Audio problem: When Uther takes the baby from Igrayne and gives it to Merlin, Igrayne's screaming and whimpering is not consistent with her mouth movements.
Audio problem: When the monkey is crawling on Marion's head at Salah's place, the sound does not match Marion's mouth.
Audio problem: When Mel Tillis and Terry Bradshaw are trying to "re-tune" their race car, when Bradshaw tells Tillis to "hit it one more time", the car makes the distinct starting sound of an older Chrysler when the car was a Chevrolet. Also, how does Tillis starts the car? He has one hand on the steering wheel and his other hand is on the doorframe.
Audio problem: When Kevin and his crew of thieving little people land in the Middle Ages, Randall informs Kevin that they made all of what's surrounding them, trees, shrubs, bushes etc. Kevin's reply is "Phew, that's not bad" He says this without opening his mouth. This was looped into the film later on.
Audio problem: When Perseus starts to swing his rope at Pegasus, the rope is absurdly loud, and is obviously just the same recorded "whoosh" sound repeated four or five times.
Audio problem: When Colombo pulls out Bond's gun it makes a noise like the top is pulled back. But he takes it out with one hand, and the hammer has not been pulled back. Even if he pulled back the hammer with a finger (which he doesn't) it wouldn't make that sound.
Audio problem: The four jerry cans of fuel Max is carrying are in fact plastic and made to carry water. They have screw on caps and smaller breather caps. When the jerry cans are dropped they make the sounds of metal ones.