Anachronisms: Hawkeye can been seen in 1980s footwear in a couple of episodes.
Anachronisms: Many of the references to films and comics mention titles that appeared well after the Korean War.
Anachronisms: The characters drink beer from aluminum cans, which were not available until well after the 1950s.
Continuity: In one of the early episodes, Henry Blake refers to his wife as "Mildred". However, in later episodes her name is Lorraine. Col. Potter's wife's name is Mildred.
Continuity: Col. Potter's horse Sophie changed sex throughout the series.
Continuity: Colonel Potter enters the series as a Methodist and is a Presbyterian just after Radar goes home.
Anachronisms: In one episode, Hawkeye calls Col. Flagg a khaki Godzilla. The movie, Gojira, didn't come out until 1954 and the American version wasn't released until 1956.
Continuity: Many of the characters' backgrounds i.e. family changes from episode to episode.
Revealing mistakes: Powerlines are visible in the background of some exterior shots.
Continuity: Throughout the entire series, the nurses referred to as "Baker" have been different women, including one (in contrast) black woman, some (in contrast) single women, and a married one, whose husband Tony spends the night with her in Hotlips' tent.
Anachronisms: In one early episode Trapper and Hawkeye walk into Henry's office and a small model of a "Huey" helicopter can be seen hanging in the corner. This was the workhorse during Vietnam-not Korea.
Anachronisms: Velcro used on the blood pressure monitors. Velcro was patented in 1955.
Continuity: Dates jump back and forth during the series. Many early episodes featuring Trapper John and Henry are set in 1952 or 1953, while others with Col. Potter and B.J. are set in 1950 or 1951.
Revealing mistakes: Two sets of the camp were built, one in the outdoors, and one within a studio. This is apparent in numerous episodes when the characters are standing "outside" in broad daylight, but each cast member has numerous shadows as a result of studio lights shining in different directions, as well as an echo within the studio that is not audible on the outdoor set.
Continuity: BJ's daughter Erin's age is constantly jumping back and forth. When he first arrives, he explains that he received his orders to report after returning home with his wife from their first night out after Erin was born. When Radar leaves, Erin is big enough to walk up to Radar and call him "Daddy." In the next season, BJ explains that on his last anniversary, Peg was still 8 months pregnant with Erin, which would make her less than 1 year old. A few episodes later, Erin is once again talking in full sentences and is nearly 2 years old.
Continuity: In Harry Morgan's first season as Colonel Potter his only child is a son whose wife has a daughter. However, by the end of the series his only child has become a daughter and her husband visits Col Potter at the 4077.
Anachronisms: Radar O'Reilly made the Cap, Wool, Knit M-1941 jeep cap famous, with some even referring to it as the "Radar Cap", however, the Cap, Wool, Knit M-1941 was only issued during World War 2, and was replaced with a different model shortly before that war came to an end.