Revealing mistake: In the shooting scene in the Mount Rushmore cafe, a boy in the background puts his fingers in his ears, because he knows the gun is about to be shot.
Continuity mistake: Right before the chariot race, when Sheik Ilderim is standing at Judah's right side and tells Judah, "Be careful, don't let him near you," Judah places his hand on the Sheik's forearm as the fanfare starts. Then it cuts to a long shot, with the Sheik now suddenly on Judah's left side, and Judah removing his hand from the Sheik's forearm.
Visible crew/equipment: When the pilots are driving the plane and a spaceship pass them you can see a shadow of a microphone. (00:04:40)
Revealing mistake: A giant lizard is stepped on by Boone. The lizard's skin turns red after being stepped on. It becomes so red that a nearby rock begins reflecting the red light. (01:55:40)
Continuity mistake: When Merryweather makes the dress blue a second time, it starts off on a ribbon that wraps itself around the dress waistline. The ribbon doesn't make it onto the completed dress.
Suggested correction: Hardly a mistake, since they're using magic and the dress changes multiple times.
Continuity mistake: Frederick picks up a bottle of champagne out of the ice bucket and shakes it a little. As he does this the foil and wire are still on top. He turns and aims the bottle at his wife, then tips it back and the foil has vanished as he now just removes the wire and cork.
Factual error: Captain Scott is sometimes seen with a Mk VI Webley, a historical anachronism as these date from 1915 onwards, whilst the film is set in 1905. This is also a continuity error as sometimes (particularly later in the film when he is fighting van Layden on the train roof) he now carries a much more period-correct Webley (MK V or earlier).