Klinger comments to Kwang that he's thinking of getting a howitzer himself--"Just think of the self-inflicted wound it could make!" This is the same man who once said that he would never shoot himself because he would ruin a perfectly good pair of nylons.
When Hawkeye receives the howitzer instead of his expected jeep, Potter orders him to get rid of it because the sight of it in camp will draw enemy fire. After trying in vain to have it sent to a non-combat unit, B.J. suggests that they put it out of their misery by removing the firing pin and pouring cement down the barrel to render it useless. That's all very well and good, but it still looks like a gun, which was Potter's whole point.
Hawkeye: Guess who, Charles?
B.J.: We've come back!
Charles: Like the belch from a bad onion!
Charles (about Kwang): HE gets a certificate of achievement?
Hawkeye: Three days with you, he should get the Purple Heart.
Kwang: Why do you wear the uniform of a nurse?
Klinger: It's a disguise. I'm hiding from sanity.
Kwang: That's crazy.
Klinger: See? It's working!
Hawkeye (to Charles): All my fleas are dead! MURDERER!
Radar does not appear in this episode.
After Hawkeye and BJ disable the Howitzer that has been mistakenly delivered to them, Hawkeye says, "Death takes a holiday." Death Takes A Holiday is a 1934 film directed by Mitchell Liesen.
Klinger is serving dinner in the Mess Tent and he says, "Welcome to Max Klinger's Kamikaze Kitchen!" There are quite a few kamikaze references on M*A*S*H. Kamikazes were Japanese suicide pilots in World War II. Their job was to crash explosive-laden aircraft into enemy targets. "Kamikaze" literally means "divine wind."