Revealing mistake: When Big Daddy Mars is set on fire in the police station he is wearing an obvious protective mask. His face lacks detail and the mouth doesn't move even though he's screaming. (01:11:07)
Revealing mistake: Have a look at the shot of the rear part of the train exploding as the locomotive pulls away from it. If there was ever a more obvious model shot, with cheesy, jerky bouncing toy trains and Action Man (TM) dolls, then I haven't seen it.