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)
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.
Hot Lips and Empty Arms - S2-E14
Visible crew/equipment: When Margaret walks into Henry's office while Trapper, Henry, and Hawkeye are watching a "training film," the actor's chalk T-mark can be seen on the floor.
Hot Lips and Empty Arms - S2-E14
Other mistake: While trying to sober Margaret up, you can see Trapper's clothing wet in spots where she hung on to him in previous takes.
Hot Lips and Empty Arms - S2-E14
Continuity mistake: In Henry's office, Margaret has pins in her hair over her ears. When she comes out to see Henry, the pins are gone.
Hot Lips and Empty Arms - S2-E14
Continuity mistake: When Margaret comes into Henry's office, interrupting the "training film" Hawkeye's part flips from being on the left to the right and back.
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