The password for this episode is "Caribbean," and Klinger and Frank disagree on how to pronounce it.
Klinger (about Jenkins): First time on night sentry duty.
Hawkeye: No problem. If there's anything out there, it'll freeze before it can make trouble.
Jenkins: Yes, sir.
Hawkeye: Hey, listen. Everybody's scared.
Hawkeye: Are you kidding? (points to himself) Winner of the Purple Chicken. With yellow-bellied clusters.
(Discussing the Chinese patient)
Margaret: I don't trust him.
Frank: I'll bet he understands every word we say.
Hawkeye: Well, I certainly wouldn't trust anyone who understands us.
Colonel Potter: You're trembling son, are you scared?
Private Jenkins: No sir. Just cold, sir.
Colonel Potter: If you had any brains, you'd be scared.
Frank (about a patient): He's...Chinese.
Hawkeye: You don't have to whisper Frank, he knows he's Chinese.
(BJ is outside the Swamp. A THUMP is heard)
BJ: Rats! (He comes inside)
Hawkeye: Who'd you bump into?
BJ: Just what I said. Rats.
Hawkeye: Lie down and rest.
Klinger: I'd rather do it in my own bed.
Hawkeye: All right, go back to your tent.
Klinger: My bed in Toledo.
Private Jenkins: Halt, who goes there?
Radar: It's the Colonel!
Jenkins: Oh, sorry. Go ahead, sir.
Colonel Potter: Don't you want to know the password?
Jenkins: I already know it, sir.
In this episode, Klinger says plainly that he is blood type B-positive. In the seventh season episode, "C*A*V*E", he says that he and Major Winchester (and Mulcahy) have the same type. In the season eight episode, ""Lifetime", Winchester says that he is blood type AB-positive. Oops!
Here, as Radar wakes him up, Hawkeye drones, "He's dead---dead and drafted." Interestingly, in the very next episode, #G507, "The Late Captain Pierce," The Army will mistakenly list Hawk as dead!
It Happened One Night is also the title of a 1934 movie starring Claudette Colbert and Clark Gable.