Revealing mistake: The stepmother's arm disappears for a split second when she tells her daughters that there is still a chance for them to become the princess.
Factual error: The cavalry sing Low Bridge (or Fifteen Years On The Erie Canal) as they trek across Texas in 1879. This was written by Thomas S. Allen in 1905 during the time the Erie canal was switched from mule power to engine power. (00:49:00)
Visible crew/equipment: When Joe Gillis returns to the mansion, after Betty Schaefer has just revealed her love towards him, when he enters his room, you can see a hand wearing a watch in the mirror. (01:26:50)
Revealing mistake: Having been deserted by their porters three white people and a native journey on. During their journey an antelope is shot by Allan Quartermain for food. The sound of the shot is dubbed in as there is no recoil from the high powered rifle he uses.
Plot hole: When major Singleton challenges Brant Royle to a duel with single shot pitons, he fires one pistol, and leaves the other pistol on the bar. He then goes into his carriage and shoots himself. He only has the pistol that has already been fired.
Revealing mistake: Rusty Cameron makes a call from a pay telephone. He makes several movements with his index finger and the sound of the dial can be heard but the dial itself never moves.
Continuity mistake: When Annie finishes her song about "doin' what comes naturally," she grabs her rifle and uses the butt to shoo the children towards the house. The man she is talking to is close enough that she could touch him with the gun if she wanted too. The shot changes to a longer shot of the same view and the man is suddenly 5 or 6 feet further away, where the gun would no longer reach him.