Continuity mistake: When the Siamese fighter (Chris's old friend) is defeated by the Mongolian fighter, Chris wipes the blood from his friend onto the Mongolian fighter. When he wipes the Mongolian, no blood is there. The blood does not appear on the Mongolian until Chris is walking off.
Other mistake: The Mongolian guy is supposed to be knocked out cold - however, he appears to smile upon being knocked down.
Other mistake: When Van Damme is in the hold of the ship the ship is under attack. Between the fight scene we can clearly see Van Damme standing on the right of the screen and watching. In the next shot he is coming out from the hold of the ship.
Factual error: The movie takes place in 1925 but the uniform of the German fighter as well as the Zeppelin's markings are those of the Empire (gone 7 years ago).