Before smashing his head into the locker to make it look like he was attacked, Col. Flagg checks the locker to make sure it will do the job. But it's obvious that it is not made of wood, but some sort of rubber or soft plastic material.
When the three soldiers who are trying to steal the penicillin run through the camp, the sound makes it obvious they are running across a stage and not on dirt.
Perkins is being treated by Hawkeye and Trapper without an MP or some other guard considering he is a criminal for trying to steal penicillin,
There's no need for the field phone to be in the prisoner tent other than for Colonel Flag to break over his head,
The doctors are fine with performing an unnecessary appendectomy is this episode, but in a later season they consider it to be mutilation and immoral.
When Colonel Blake comes out of his tent to use the latrine he is walking behind Klinger who is on patrol yet Klinger runs to his position without turning round,