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. Submitted by Bob Blumenfeld

Season 4. Episode 1 "Welcome To Korea". At the end of the episode the new commanding officer, Colonel Sherman Potter, played by Harry Morgan is introduced. In Season 3 Episode 1 "The General Flipped at Dawn", Harry Morgan played Major General Bartford Hamilton Steele.

Season 4. Episode 1 "Welcome To Korea". To get past the checkpoint, Hawkeye claims Radar has neurapraxia - "disease of the nervous system that makes you foam at the mouth." This seems like the perfect setup for a joke where neurapraxia turns out to be something funny, but it is really a condition of the nervous system, but is caused by injury (usually sports related) and only causes weakness in the extremities.

Spearchucker Jones was removed from the series after the writers were informed that there were no black surgeons stationed at MASH (Mobile Army Surgical Hospital) units, during the Korean War.

Timothy Brown, who plays Spearchucker Jones, was also in the 1970 film, listed as "Tim Brown", and played Corporal Judson.

While he was known for the role, William Christopher didn't play Father Mulcahy in the series' pilot

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.

Stuart Margolin, who played Major Robbins (the plastic surgeon) in Season 2 Episode 18 "Operation Noselift" also played Captain Sherman (psychiatrist) in Season 1 Episode 7 "Bananas, Crackers and Nuts".

The only actor from the movie who also played his role on TV was Gary Burghoff (Radar).

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.

MASH the TV show lasted 8 yrs longer than the actual Korean War did. Submitted by Rikki

Both the movie and TV show MASH were based on the experiences of Dr Richard Hooker. In 1968, he authored, MASH: A Novel About Three Army Doctors. Subsequently he refused to watch the TV show, feeling it was too liberal. Submitted by Rikki

The only episode whose name was displayed during the broadcast run (as versus on the DVDs) was the final one, "Goodbye, Farewell and Amen." Submitted by Bob Blumenfeld

All of the characters, based on the characters from Richard Hooker's novel, were composites of people Hooker knew, met casually, worked with, or heard about.

Kario Salem, who played a youngster in season 4's "deluge" also played Private Weston in season 10's "follies of the living-concerns of the dead."

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 exception is 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.

Gary Burghoff's left hand was slightly deformed, and he often hid it behind his clipboard during filming.

At the credits, the fictional character is mentioned: "Tuttle.........as himself"

According to the M*A*S*H A&E Biography they were not allowed to have blood on any of the doctors/nurses outfits in this episode. The network didn't even want them to be in the operating room in the first episode.

In the scene where Hawkeye & Trapper are trying to figure out who the Korean woman is asking for, Trapper suggests she's looking for Captain Forrest. This could be a reference to the feature film, in which, Captain Duke Forrest is one of the swampmates.