Top Secret!: When Nick first meets Hillary at the restaurant, she tells him how her uncle taught her to dislike most television, though she allows M*A*S*H and The Mary Tyler Moore Show were pretty good.
Volcano: As a reporter is describing how doctors are treating patients in the parking lot (because the emergency rooms are filled to capacity), he says it looks like a M*A*S*H unit.
Castle: In the episode "Cops & Robbers", a group of bank robbers who rob a bank (that Castle and Martha happen to be in) use the names of fictional TV doctors as aliases, including Trapper John.
Fast Forward. A mock news report on increasing tensions with North Korea warned that a second Korean War could lead to another series of M.A.S.H.
Sesame Street: Big Bird's teddy bear, Radar, is named for Gary Burghoff's character, who also owned a teddy bear.
At the end of the Loretta Swit episode of The Muppet Show, in which she took over Miss Piggy's roles in "Veterinarian's Hospital" and "Pigs in Space", Piggy appears dressed as Major Houlihan.
Pyramid magazine's "Campaign in in a Box" Yrth-2 is set on a planet where multiple SF settings with radically different technology have been mashed together. One faction are the "7044s", a mobile army hospital from a nasty war in a nanotech-filled 2074. The representative of this faction is a sardonic nanosurgeon called Captain John Quincey "Dr Joker" Remmington MD, who is clearly based on Hawkeye Pierce.
In Arthur, King of Time and Space, the irreverend and cynical Sir Dinadin is drawn identically to how Paul draws Hawkeye in his (non-triangle) fan comics. In addition, the Space Arc version of the Trojan War riffs on M*A*S*H, just as the crew of the Excalibur riff on Star Trek and Merlin riffs on Doctor Who.
In "Fifteen Minutes of Shame", when the Griffins get their own reality show, the producers come up with a way to write Meg out of it. The ensuing cutaway shows Brian (as Radar) announcing that Meg's plane had been shot down over the Sea of Japan. Stewie then enters in drag (as Klinger) asking "Who do I have to see about a Section 8?".
In "Breaking Out is Hard to Do", Joe chases the Griffins in a military chopper, and his Asian co-pilot says he always pretends he's shooting at Alan Alda and Jamie Farr.
In "Stewie B. Goode", Stewie starts singing "Suicide is Painless" when he gets drunk.
In the epilogue Peter reveals he was inspired by Alan Alda directorial tenure to begin exerting his influence on Family Guy. It went as well as you'd expect.
In "It's a Trap", the opening caption reads "A long time ago, after M*A*S*H but before AfterMASH..."
In "Killer Queen", Peter tells a story in which he saw a guy eating fried chicken on the bus and swiped some of it before tearfully revealing it was actually a baby.
In "Family Guy Through the Years", a frame from M*A*S*H can be seen in the background during Peter's introduction.
Robot Chicken: In "Celebutard Mountain", we see a sample of VH1's Top 100 Final Episodes Ever countdown, which includes Hawkeye's emotional breakdown ("It wasn't a chicken! It was a baby!") intersped with a Laugh Track.
In a flashback from "Lisa's First Word", Marge asks her girlfriends how they liked the final episode of M*A*S*H.
In "Brother from the Same Planet", Dr. Hibbert gives Lisa a M*A*S*H coloring book to pass the time with while her eardrops sink in.
In "Bart of Darkness", an intense heatwave causes the statues at the Springfield Wax Museum to melt, and Principal Skinner complains "I'm up to my knees in the original cast of M*A*S*H!".
In "Half-Decent Proposal", the scene where Artie Ziff takes Marge via helicopter to spend the weekend with him parodies the ending to final episode, with Homer spelling out "KEEP YOUR CLOTHES ON" in white rocks.
In "Whiskey Business", Moe calls a suicide hotline, and "Suicide is Painless" plays on the phone when he's put on hold.
In "The Yellow Badge of Cowardage", in a parody of the M*A*S*H opening sequence, Dr. Hibbert loads a kid with brain-freeze onto what appears to be a medic chopper, but turns out to be a carnival ride.
In "E My Sports", a solo piano version of "Suicide is Painless" plays when a riot breaks out at the Conflict of Enemies championship and the riot police are called in.
