影片疏失

Continuity: After the boys rescue Dr Weitzman and Riley is pushing his wheelchair, he has a cast on his left leg. However, when he is helped out of the van at the sanitarium, it has jumped to his right leg.

Continuity: While visiting home, Henry's daughter is wearing a rainbow heart bracelet in one shot, which disappears in the next.

Boom mike visible: In the scene when Billy is in the van telling the Wolfen (1981) story, the microphone is visible over Henry's left side.

Errors in geography: The movie takes place in New Jersey, but the license plate of the van is from New York.

Continuity: As the van pulls out of the hospital grounds, no traffic is passing in either direction, and the only traffic control is a small portable STOP sign at the guard's booth. But when the van enters the public road, it passes a long line of vehicles that have obviously been held up for the film production.