Trivia: Early on in this episode a scene takes place in the shower between Harry Morgan and William Christopher. Right before the scene ends William pulls the chain on the lever for the shower to turn on, but the water doesn't come on; in fact when he notices the water doesn't come on, he holds onto the chain and the lever actually comes off. You can tell by his facial expressions this was totally unexpected, but since this was the end of the scene and no further dialog was needed, it was left in.
Trivia: In one episode, Hawkeye says to Radar, "You're a good man, Charlie Brown", a reference to the off-Broadway show of the same name based on Charles Schultz' Peanuts characters. Because the show didn't debut until 1967, this would appear to be a mistake, but it is not. The reference was intentional, an inside joke: Gary Burghoff played the title role in that play.
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Trivia: Season 2 Episode 5 "Dear Dad ... Three". Hawkeye and Trapper tell the racist soldier the story of Dr. Charles Drew. Drew was the inventor of techniques for separating and storing blood products. He was in a bad car accident and, legend has it, died because the 'whites only' hospital refused to give him a transfusion. This is an urban myth - he did die after that accident but was treated properly at the hospital.
Trivia: The actor Mako (birthname Makoto Iwamatsu) played many different roles on MASH, usually Korean (North and South) and once Chinese. In the Korean roles, Mako spoke perfectly pronounced Korean even though he was Japanese (a naturalized American in 1956). Mako also served in the U.S. Army for awhile in the early 1950's, the same time MASH is set.
Trivia: To show the horrors of war, Alan Alda had it written into his contract that there had to be at least one scene in each episode that took place inside the operating room. The exceptions are the episode 'Hawkeye', of season 4, where after Pierce is injured in a jeep accident the episode takes place at a Korean family's home, and the 4th season episode "The Bus". However in that episode the doctors treat the Korean soldier's leg injury on the bus.