Revealing mistake: During the showdown between Hawk and Voltan, Hawk frees Gort by cutting his ties, Gort then grabs his hammer and whacks the guard with it and punches another guard. If you watch the pillars you can see them wobble slightly when the guards' bodies make contact with them. (01:26:33)
Revealing mistake: At the end when Hawk fatally wounds Voltan there is a slow motion shot of Voltan rolling around in pain on the floor and his helmet falls off, revealing his whole face. You can see he is not wearing his burn make-up here. (01:28:16)
Revealing mistake: When the slave trader is showing the two men the slaves that he has for sale you can see one of the slaves has a mark on his wrist from a wristwatch. (00:51:07)
Revealing mistake: When Ranulf approaches the bandits on horseback you can see a part of his real hand in his sleeve sticking out as he cups the crossbow with it. (00:20:30)
Revealing mistake: When Hawk is enchanting his fathers sword he holds the "mind stone" in the palm of his hand and you can see a wire attached to each side of the stone. A few seconds later and, of course, it "magically" lifts from his hand. (00:03:14)
