Continuity mistake: While Hawkeye holds the tail assembly, Trapper cuts the wires. In the closeup, he cuts the wires a few inches from the connectors. In the wide shot, the wires were cut closer to the bomb's body.
Visible crew/equipment: In the kitchen, as Klinger and Winchester banter back and forth, the shadow of the boom mic can be seen in the upper right corner of the shot.
Dear Mildred - S4-E7
Revealing mistake: When the camera is in a close up on Dan the pilot, the sound is a chopper that is running full power, but you can tell that the main rotors are turning slowly to simulate flight.
Continuity mistake: Before The Sniper starts firing, Hawkeye is carrying the two bottles of scotch firmly gripped by the necks. A second later, he's barely holding them by the caps, in preparation to drop them.
Factual error: In the beginning, Hawkeye says that the patient was full of shrapnel from a claymore. M*A*S*H was set in the early 50's, and the M18 Claymore was only in the development stages in 1952, and not accepted and battle used until Vietnam in 1961.
Bombshells - S11-E6
Character mistake: When the band is playing "Hooray for Hollywood", the conductor's beat pattern is backward: up-down instead of down-up.
Are You Now, Margaret? - S8-E2
Factual error: Then camera Klinger is using is not period correct. Those Brownie cameras were not around at that time.
Other mistake: Frank Burns states when he is talking to a patient who just got a purple heart, that he would like to get a purple heart, but in the earlier episode ‘The Kids', Frank Burns received a purple heart due to a injury, and in the S1 episode ‘Sometimes You Hear the Bullet', Frank Burns gets another Purple Heart. Despite them both being stolen, they still count on his army record.
Visible crew/equipment: In the last scenes of the episode, the overhead shots showing the parade where Klinger rides in on Sophie, dressed (undressed) as Lady Godiva, you can see the boom mic in view at the top of the screen.
Continuity mistake: In the beginning, Colonel Potter is painting a portrait of Hawkeye. In the preceding episode, The Korean Surgeon, the painting is finished and hanging on the wall in Colonel Potter's office. It is hanging just to the left of the door. The time given is from The Korean Surgeon where you can see the painting hanging on the wall. (00:17:05)
Continuity mistake: As Mulcahy enters and is introduced by Potter, he assumes the podium, and clasps his hands behind his back. A second later, his arms are by his sides.
Continuity mistake: When the red head woman is playing the piano, it's a double. In the close up her hair is back and you can see her face. In the wide shots her hair covers her face so as to conceal the switch.
Continuity mistake: Charles and the G.I. lay waiting for an explosion. When the last mortar hits, the explosion is just to the left of the back tire, the jeep is untouched. After a cut, the jeep is trashed and burning.
Revealing mistake: In the closing scene, as the camera looks at the collected crowd, the camo net over the building poorly hides the edge of the "sky" background and the sound stage walls.
White Gold - S3-E23
Continuity mistake: As the men are sneaking by the tents, Hawkeye's voice is heard coming from a tent with opaque windows. A minute later in all the commotion, he's seen coming out of the Swamp.
Other mistake: After pulling out of the camp to head for the cave, The Bus is shown from several angles. Even though it's loaded, the shots of it travelling are re-used shots from an earlier episode, and the place it stops is a re-used shot from the episode "Rainbow Bridge"
Continuity mistake: In the storage tent, between wide shots and close ups, the rank insignia on Blake's hat goes from centered to over his right eye and back a few times.
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