Plot hole: Jamiel delivers Ali Baba's ransom note to Hulagu Khan by throwing a knife, and the shocked Khan and his guards look to the window. Since Jamiel does not duck away immediately, he should have been seen and identified immediately, but nothing of that sort happens.
Ali Baba and the Forty Thieves (1944)
1 plot hole
Directed by: Arthur Lubin
Starring: Jon Hall, Andy Devine, Maria Montez, Turhan Bey
Revealing mistake: When Abdullah escapes his Mongolian pursuers by jumping his horse across the ravine, the horse kicks loose some debris at the edge. But the rocks simply disappear, indicating that the ravine is a painted set-up.
Trivia: Hulagu Khan (1217-1265) was the grandson of Genghis Khan, and the brother of Kublai Khan, perhaps the two most famous Mongol lords. He conquered Baghdad in 1255.