Revealing mistake: In the mess, you can see everyone has their food on metal trays and ceramic dishes. Sgt Zale, though, has his lemon pie in a polystyrene dish - so that it doesn't hurt Klinger when he gets it in the face. (00:08:15)
Audio problem: During the fight in Rosie's bar, a soldier is punched, and then thrown through the opaque window with the wood frame behind him. There is a sound of breaking glass accompanying the motion, but you can see the torn paper.
Frank Burns: I know I'm a real asset.
Hawkeye: You're only off by two letters.
Trivia: Gary Burghoff's left hand was slightly deformed, and he often hid it behind his clipboard during filming.
Question: A number of times it is mentioned that the outfit is unarmed, yet several times, Frank has a rifle, or a pistol, and once Klinger had a grenade, and the guards and Klinger, while on sentry duty, has a rifle. Was this standard, or is this a mistake?
Answer: The Geneva Convention allows even doctors to carry a sidearm to be used in their self defense or the defense of their patients, however it is rare to do so.
Answer: As an old medical unit staffer, my experience is that med units have combat units assigned to defend them. Usually it was marines.
Answer: My old doctor (now deceased) served in Korea during the War. He was required to carry a sidearm anytime he was not in the hospital.
Answer: Even an Army field hospital would have SOME weapons for self-defense if the enemy attacked. What's meant is that it's not a combat outfit, and therefore wouldn't have enough weapons to actually attack anyone. (It's also mentioned a few times that the Officer of the Watch is supposed to carry a pistol at all times, but Hawkeye refuses to do it when he's in charge and Colonels Blake and Potter don't enforce the rule).
Captain Defenestrator