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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. See more...
M*A*S*H (1972) - 2 mistakes in "Potter's Retirement"
starring Alan Alda, David Ogden Stiers, Loretta Swit, McLean Stevenson, Mike Farrell, Wayne Rogers (add more)
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Series 10 
Series 1, 2, 3, 4