Revealing mistake: In the final Indian chase at the conclusion of the film, when a covered wagon rolls over, one can see the rope that was used to ensure it tipped over.
Revealing mistake: In the first scene of the crashed meteor, on the extreme left of the scene where the smoke is, it seems to be billowing up from behind a stage wall, as there is a definite vertical line and a gap between the smoke and the left edge of the frame.
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.