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: In the last shot of the film, the zombies are walking across the bridge to New York City. Below, there are cars on both sides of the bridge driving to and from the island with absolutely no concern for the chaos that is supposedly taking place. I guess the filmmakers couldn't stop traffic for a few minutes to get the shot?
Other mistake: When Larry Crocket runs out of the house in his underwear and gets attacked by Barlow, later when the police find him his clothes are in the car. How is that possible when he ran out of the house with his clothes still inside?
Other mistake: When George is in the basement, his son starts walking down the stairs. Suddenly a light bulb shatters right next to the boy's head, he screams, and falls violently down the stairs. But when it cuts to George coming over, he's just walking at a normal pace as though nothing happened. (This is just after they move in, before the evil spirits take hold of George, so there's no reason for him not to be alarmed.).
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)