Continuity mistake: At Skull Rock, after the crocodile has nipped off a good bit of Hook's clothing, sock and shoe, when Hook rushes toward Smee in the boat the crocodile opens his mouth, and just as he swallows Hook he's nearly fully clothed and wearing both socks and both shoes.
Continuity mistake: While the close-ups showed heavy ice build-up on the doomed plane, the long shots showed no ice at all.
Revealing mistake: In the scene where Lancelot runs into and fights Arthur's ambushers, he runs one of them through with his sword. It is visible that he stabs his opponent past the body, but close enough for the appearance.
Other mistake: In one scene Tyrone Power and his men survey a village where all the inhabitants have been killed by rebels. A dead boy is on a table and as the camera pans back he is wriggling his toes.