Other mistake: When Edwin paralyses Isabelle with poison she almost immediately drops down and loses the ability to speak. When he tries to poison Royce and instead gets stabbed in the jaw with his own poisoned blade, Edwin gets paralysed and can't move, but still begs for mercy by saying "please don't kill me" when Royce drags him. (01:28:48)
Other mistake: Given that Cassandra's parents are so incredibly rich, spoil her rotten, buy her anything, and have even got her a luxury apartment, why on earth is she flying to the USA in economy class?
Other mistake: When Sam Flynn first enters the arcade, he goes to a breaker box on the wall. When he opens it, the breakers are already in the "ON" position, closest to the center. He actually turns them to the "OFF" position.
Other mistake: After Dan is killed by wolves you can see his corpse is covered by snow, only his hand is showing. When daylight arrives, you see that all the tracks on the slopes are still visible, and big patches of brown can be seen even though it's supposed to have been snowing at least 30 cms, enough to cover a human body.