As Radar drives the jeep, it starts off with serial number 6930382 while picking up Hawkeye and McIntyre, then the jeep is shown as very muddy, then when they reach the helipad, the jeep has no mud and its serial number has changed to 11172419.
In the officers' club, Borelli finishes his drink and declines a refill. When Hawkeye toasts, Borelli takes a drink from a half-full glass before putting an empty glass back down on the bar.
British soldiers in Korea wore a uniform similar to GI fatigues, not disruptive pattern material as worn by Major Taylor. DPM didn't come into use in the British forces until the mid-seventies.
Dr. Borelli asks Hawkeye and Trapper if it's okay for them to be in an officers' club, but at least three customers are wearing suits and ties -- which certainly wouldn't pass muster for a military establishment.
1970s vehicles are visible in the Tokyo stock footage early in the episode.
At the beginning as Radar is driving the Jeep all over the camp, we can hear the sound of tires screeching on pavement, even though he's driving through the muddy, rutted tracks throughout the camp.
While talking to Henry in the pool, Frank says he has "inconvertible proof". The word is "incontrovertible".
When the helicopter takes off at the very end it's very obvious the passenger is not Robert Alda.