Revealing mistake: As Machine Gun Joe runs slowly runs over a fisherman in a small brook, he stops and "peels out" on his head. You can see a film crewman in the driver's seat doing the actual carnage.
Revealing mistake: There are two actual games played out: one in Huston and one in Tokyo - the score board has identical faulty light bulbs in both locations.
Revealing mistake: When the black guy is attacked after being let go, his throat is slashed. Check out how dreadfully fake the blood is. It looks like watered down ketchup.