Continuity mistake: Charles arranges a prank that involves a cake. The cake looks totally different in the respective shots. At least three cakes were involved: The one Klinger gives to Margret looks different from the one she holds in her hands when walking over to Capt. Hill. The one she holds in her hand in the closeup counter shots is yet another pie.
Continuity mistake: Charles (in scrubs), Radar, and Father Mulchahy are all in the changing room when Radar and Mulchahy go take a phone call. When entering the comm room, Charles has appeared and is complaining about waiting for a phone call in his fatigues.
Revealing mistake: When the ambulance arrives in the compound at Christmas eve, it drives through the newly fallen snow, but it doesn't leave any tracks. Vehicles driving over a very thin snow cover always leave dark tracks, because the pressure instantly melts the snow just below the wheels. Even a person walking through the snow would leave dark footprints under these conditions.
Continuity mistake: While Igor is serving dinner, his cap peak goes from being up in the front shot to down in the side shot, while he is talking to Col. Potter.
Visible crew/equipment: While BJ's holding Peg's letter and telling Hawkeye about being homesick and depressed, the edge of the Swamp set can be seen at the top, left corner of the screen.
Visible crew/equipment: After Radar shows the box of bees to BJ and Hawkeye, when BJ gets in the jeep and drives off, just before the shot cuts away we can see the T-mark on the ground at Radar's feet.
Visible crew/equipment: After a 14 hour shift in the OR, when sleepy BJ and Hawkeye are in the change room just as Hawkeye says, "Let's face it, their demand is bigger than your supply," the shadow of the moving boom mic is visible on the curtain.
Continuity mistake: When BJ and Hawkeye are peeking into Radar's box of bees, in the wideshot there's tape on the box, but in the closeup the tape has vanished.
Visible crew/equipment: As the M.P. jeep escorting the General's jeep gets close to the camera, a reflection of a lighting rig or reflector is seen in the right windscreen.
Hot Lips Is Back in Town - S7-E19
Revealing mistake: While Hawkeye's in the shower Radar shows up with a cup of coffee, and when Hawkeye steps out of the shower stall the door swings out so we can see the top of whatever Hawkeye's wearing.
Hot Lips Is Back in Town - S7-E19
Factual error: In the beginning, you can see that there's a First Lieutenant bar on Margaret's left collar instead of the medical symbol Caduceus, like Charles has on.
Other mistake: After pulling out of the camp to head for the cave, The Bus is shown from several angles. Even though it's loaded, the shots of it travelling are re-used shots from an earlier episode, and the place it stops is a re-used shot from the episode "Rainbow Bridge"
Rally 'Round the Flagg, Boys - S7-E21
Revealing mistake: When Col. Flagg holds his pistol up to stop Mr. Pak Sr. from leaving, you can see there is no magazine in the pistol.
Rally 'Round the Flagg, Boys - S7-E21
Deliberate mistake: When Flagg turns out the light to escape. To make that effect they had to freeze a frame and then start again. If you look closely after Flagg turns out the light you can see Hawkeye and the Korean Man on the far right freeze. Then it shows Potter ordering the light back on.
Rally 'Round the Flagg, Boys - S7-E21
Revealing mistake: As Charles leaves the Mess Tent, you can see the camo net where there normally is none, and the background abruptly ends about 20 feet from the end of the building.
Preventative Medicine - S7-E22
Other mistake: During the duration of the episode a wounded person is addressed as Corporal North but during the credits he is called Private North.
Preventative Medicine - S7-E22
Continuity mistake: In Potter's quarters Klinger's arm holding the chicken goes from in front of his chest to by his waist between shots.
Preventative Medicine - S7-E22
Continuity mistake: As Lacey tells Margaret of his plans, he has his fork in his right hand. After she asks "What makes that hill so important?" he suddenly has the knife in his right hand, and the fork in the left.
Answer: The C-42 was a military variant of the Douglas DC-2. Very few C-42's were built, so it's questionable that Potter would specifically have seen that particular model, but, given his military background, it's not entirely unreasonable that he might use the military designation even when the aircraft in question is actually a civilian DC-2.
Tailkinker ★