Frank Burns: I love it here.
Col. Potter: Either you or Klinger is nuts. Now I have to figure out which one.
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. See more...
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Other: 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.
Deliberate "mistake": These errors I assume were caused by the show running 3 times longer than the real war. Col. Potter arrived at MASH in September 1952 a year before the war ended, then a few months passed by Margaret got engaged for 8 months, then Frank Burns left and Charles took his place. In this time the war would have ended. In the final episode Margaret mentions Charles has been there for 2 years. Which means he would have arrived in 1951 a year before Trapper and Henry left and Col. Potter arrived. It's a lot to take in.