When Frank interrupts the poker game Father Mulcahey tucks money into his hat which subsequently disappears.
In "Germ Warfare" (S01 Ep11), Frank's blood type is stated to be AB Negative yet in this episode it is stated as B.
As per the title, Hawkeye is accused of mutiny, but that offence cannot be committed by just one person.
Cpl. Klinger is shown having his own tent. An enlisted man would not be billeted to his own tent; he would share a tent with several other enlisted men. (Klinger is shown once again having his own tent in the following season's "The Abduction of Margaret Houlihan.")
When Frank is knocked unconscious by the O.R. door, Hawkeye tells Father Mulcahy to take over in pre-op. Mulcahy, with no medical training, would be unable to make the necessary triage decisions required of him.
BJ says "Pre-op means 'preparation'." The suffix "pre-" actually means "before" as in "before an operation".
Even for the purpose of a military hearing the Army would not have all of the surgeons away from the MASH at the same time.
When Frank is searching through Radar's drawer looking for the "stolen" money, he pulls out a Spider-Man and an Avengers comic. The issues are Amazing Spider-Man #81 (February 1970) and Avengers #72 (January 1970). Spider-Man wasn't created until 1962 and the Avengers one year later in 1963 - the Korean war ended in 1953.
When Major Burns inspects the kitchen and cold storage the "cook" is shown to be Sgt. Zale. All other times Zale is the Supply Sgt. and is not a cook.
During Frank's version of the "mutiny" during the OR session, he says that he's blood type B. However, in "Germ Warfare," it had been revealed that Frank was blood type AB (negative).
Colonel Potter's ribbons only show his Korean War service ribbons. According to his biography he served in both World War I and World II, therefore he should have World War II campaign ribbons and a World War I Victory ribbon.
When Radar describes going through Klinger's tent, the colonel asks if "this Corporal Klinger" is a nurse. However, army nurses automatically received officers' ranks when they joined up, therefore a corporal would not be a nurse. One would think the colonel would have been aware of this.