Factual error: At the end, after BJ has received his Bronze Star, Colonel Potter dismisses the formation with "At Ease. Dismissed." According to Drill and Ceremonies as I learned them, this is impossible. The only legal command from the at-ease position is "Attention."
Add timeBob Blumenfeld
Factual error: When BJ and Hawkeye go to Potter to talk about Cho Lin wanting to get married at the 4077th, Potter mentions he expects to be home in Nebraska in 16 months, three weeks and four days when they try to fool Potter about Cho Lin. Potter has always said he and his family live in Missouri, however.
Other mistake: Across the show, several times doctors looking at an x-ray picture say things like, "Looks like he swallowed a whole junkyard" or "His belly is full of shrapnel." In fact, shrapnel, being metal fragments, should show up as clear white spots on the x-ray pictures, but none of that is visible in any of the x-rays shown throughout the show.