Continuity mistake: The psychiatrist is called Milton Freedman in this episode and Sydney Freedman in all other episodes in which he appears (always being played by the same actor - it is the same psychiatrist).
Hot Lips and Empty Arms - S2-E14
Continuity mistake: When Margaret is seen drunk in Henry's office it is daylight outside. Radar brings news of incoming casualties so they rush outside where it is pitch dark. (00:20:00)
Continuity mistake: When Hawkeye and Lt. Johnson are sharing Hawkeye's bottle of "wine" there's a closeup of Johnson's hand holding the glass, and in the closeup that hand has short nails, whereas in all other shots Johnson has long nails.
L.I.P. (Local Indigenous Personnel) - S2-E7
Continuity mistake: When Lieutenant Willis wakes up in the Swamp and puts his shirt on he's wearing his dog tags, but when he tosses the papers and puts on the rest of his clothes the dog tags have suddenly vanished, then they reappear, vanish, and reappear again.
Continuity mistake: Margaret is shampooing Frank's hair; she raises her foam covered hands to allow him to kiss her. The camera angle changes and her hands are nearly foam-free. (00:03:25)
Hot Lips and Empty Arms - S2-E14
Continuity mistake: Margaret is in Henry's office drunk and she tells Henry that he looks just like her father did before he died. In Season 9. Episode 4 "Father's Day" Margaret's father, Alvin 'Howitzer' Houlihan, visits her at the 4077.
For the Good of the Outfit - S2-E4
Continuity mistake: Henry pops out the golf ball he is washing into the towel. After he finishes talking to Hawkeye, he resumes washing. However, no ball is missing from the dirty pile. (00:02:45)
The Trial of Henry Blake - S2-E8
Continuity mistake: In the scene of Klinger trying to escape from the 4077 on a hang glider, he secures himself into the control frame, but then when he takes off, he's hanging off the frame's bottom bar. (00:10:40)
Continuity mistake: When Frank walks into the Swamp and puts down the typewriter, in shots facing Frank the manila envelope's open flap faces up, but in shots facing Trapper and Hawkeye while they're pretending to argue the envelope is flipped over with the flap facing down, then when Frank walks back to the envelope the flap faces up.
Continuity mistake: While Hawkeye and Trapper are playing shotglass checkers Frank lathers shaving cream onto his face, but in his closeups the thick foam is dried out.
Continuity mistake: While Trapper and Hawkeye are lying on their cots, one by one everyone joins them in the Swamp, and in Trapper's closeups the "USA sterilized" that's printed on his pillow is upside down, but in the wideshots his pillow's flipped over with the print right-side up.
For the Good of the Outfit - S2-E4
Continuity mistake: While Radar and Hawkeye are in the mess tent, after Hawkeye cracks a joke about how the cook sculpts grease into the shape of lamp chops, between shots facing Radar and the shots facing Hawkeye we see Radar either holding bread in his right hand or a fork.
Continuity mistake: When Trapper and Hawkeye are sitting outside the Swamp, Hawkeye pours the martinis from the tall glass beaker, and in the shots facing Hawkeye there are quite a few large ice cubes in the beaker, but in the shots facing Trapper there aren't as many ice cubes floating in the beaker.
The Trial of Henry Blake - S2-E8
Continuity mistake: When Radar walks into the Swamp to sell wingtip shoes to Hawkeye, the dartboard isn't hanging on the door, but in two of Radar's closeups we can see part of the door with the dartboard on it.
L.I.P. (Local Indigenous Personnel) - S2-E7
Continuity mistake: After Lieutenant Willis wakes up in the Swamp he gets dressed and puts his tie around his neck with its tail end on his right, but when it cuts to his closeup the tie's wide end is at his right side, then it switches again.
Continuity mistake: When Hawkeye's saying goodbye to the nurse in the morning, he reads "35591715" from her dog tag and says, "Even your number is pretty," and then he makes another date with her and again reads her dog tag, but now the number's "39591715."
Dr. Pierce and Mr. Hyde - S2-E5
Continuity mistake: After Hawkeye and Trapper leave the OR, when they open the door to the Swamp the dartboard is not hanging on the door, but in the interior shot the dartboard's there.
The Sniper - S2-E10
Continuity mistake: At the picnic, the basket is sitting with the end towards the camera, and bottle of liquor in it. Before the first shot from The Sniper, the basket is sideways, and the bottle in front towards the camera on the ground.
Continuity mistake: When Hawkeye hits on the nurse after Charlie's first flyover, his beach chair instantly folds itself up. (00:06:40)
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