Other mistake: When Ripley is trying to deactivate the self-destruct mode, the instructions she follows on the container are actually just the French interpretation of the instructions she read to activate self-destruct before.
Other mistake: When Jody finds the dwarf in the car and recognizes it to be his deceased friend Tommy, he has a quick flashback to Tommy in the coffin and the exact moment Tommy was murdered. But the second flashback makes no sense, Jody never saw Tommy being killed and was told by Reggie that he committed suicide.
Other mistake: When Max's wife goes to get ice cream, you can see Max's black Interceptor in the driveway of one of the house, right before one of the bikers loses his hand.
Other mistake: When the robotic Ilya punches her way out of sick bay, the edges of the hole should be pointed outward, and there should be debris on the floor. There is no debris, and the edges are pointing inward.
Other mistake: Whilst Captain Holland, Lieutenant Pizer, Dr. McCrae, Bob and Vincent are riding in the ship's transport system, the tube comes to an abrupt end due to meteorite damage. Since the tube is outside the ship, there would be no air left for the humans to breathe, nor could they survive in outer space completely unprotected for long. Plus, they would't be able to hear Bob's statement that they should try the main corridor. (01:17:40)
Other mistake: When showing the animals outside of the cabin, the shot of the deer is obviously stock footage. The video quality doesn't match the rest of the movie. (00:28:40)
Other mistake: In the boat chase on the Tapirape, Bond's torpedo hits the enemy boat either on its back or left side, but neither are damaged by the explosion in a subsequent shot. (01:18:15)