When Maurice is recounting the tale of "The Colonel" shooting down a Chinese aircraft to Ruth Anne at Joel's party, he says the Colonel "blew him into shrapnel with his 50 millimeter cannon." The US military has never used a 50mm cannon round, and one was never used on US military aircraft. The aircraft that Maurice would have flown in air combat against the Chinese in Korea would have been equipped with either .50 caliber machine guns, or 20mm cannons, but not a 50mm cannon, and a military pilot like Maurice would certainly never make this mistake.