Revealing mistake: When Warren begins shooting Bob, a massive blood spurt is shown each time he shoots him. Each time he is shot, the blood spurts don't line up with the area where Warren shoots at. The first time Warren shoots Bob, the gun is shown firing at his stomach, but the blood is shown spurting from his chest. The second time he shoots Bob, the gun is fired at the top of his chest, but the blood spurts come from a couple of inches below where he was shot. (01:57:00)
Revealing mistake: When a force 10 gale is blowing and the CGI snow is horizontal... ... none of the trees move one bit, not one.