Crew or equipment visible
During the breakout, Ollie winds up with a Tommy gun - even though he was under suspicion by the "Tiger" and shouldn't have even been close to a weapon. If you look at the gun, it has a telescopic sight on it, something a sub machine gun would have never had, owing to the high rate of fire and the propensity of the weapon to "climb" whilst being fired.
The camera is positioned too low during Stan Laurel's dance in the "Lazy Moon" sequence. At several points Stan's head is partially or completely cut off by the top of the frame as he leaps in the air.