While operating on Colonel Potter, wounded suddenly arrive. BJ immediately walks over to another table and asks to see x-rays. With triage just beginning there would be no time for x-rays to be taken, and then developed as the process in the 1950's was a lengthy one.
An announcement over the PA system tells Radar to answer his phone. The PA originates in Radar's office, therefore anyone making the announcements could answer the phone.
Radar writes to his mother that he finally got a pet, despite the fact that he has numerous cages full of animals (including rabbits, a skunk, and a large tortoise) outside his office. He doesn't consider wild animals to be pets, but rescues.
Radar says there are 200 people in their MASH, which means there were 20,000 toes to inspect during foot inspection. Actually, there would be 2,000 toes. This was likely a miscalculation on Radar's part.
Radar says that the Russian writing on the North Korean's gun has backwards R's and P's. Actually the Russian (Cyrillic) alphabet has characters that resemble backwards R's and N's, but not P's.