Other mistake: After Klinger gives the long johns to Mulcahy, he "disappears." But if you look closely through the camo net, you can see him in the shadows of the background.
Revealing mistake: As Buzz is stopped at the tent door by Hawkeye and Trapper, the vertical edge of the "sky" is seen over the top of the hospital building, behind the camo net.
Continuity mistake: After BJ and Hawkeye taste Klinger's plateful of Spam Parmesan they all sit down at the table, and when BJ pulls the plate away from Hawkeye it cuts to another angle and the knife has jumped to the other side of the plate, and the fickle cup keeps sidling across the table to be beside the bowl depending on the angle.
Visible crew/equipment: When Trapper and Hawkeye are in the Swamp they start arguing, and just as Hawkeye grabs the mandolin the edge of the Swamp set can be seen at the top, left corner of the screen.
Continuity mistake: When Father Mulcahy's finishing up his Sunday service with only Klinger, who's wearing a fetching red hat, there are nine stacked books at the corner of the table, but when it cuts to Mulcahy's closeup there are now only six stacked books (which will soon be used for the 11:00 Protestant service when Trapper and Hawkeye will pray for booze).
Visible crew/equipment: As Kelley gets up to allow Sidney to sit, the tip of the boom mic bobs in the top of the frame.
Continuity mistake: Frank hits the pole supporting the center of the tent, which lets the tent collapse. However, in later episodes, the tents, especially hers, has a sturdy wood frame and doesn't need a center pole.
Continuity mistake: When the two soldiers get into a brawl in Post-Op, it's daytime. When Potter talks to Mulcahy, it's night. Then Klinger tells Mulcahy he's needed to break up the fight, it's daytime again.
Suggested correction: In scene 1, set in the day, the Greek soldier is wearing a dark blue jacket and a light blue shirt. In scene 2, set at night, Father Mulcahy is wearing a black shirt and a brown robe, and resting before bed. In scene 3, set during the day, Father Mulcahy is wearing a black shirt, a sweatshirt, and a baseball cap. He is punching a speed bag. Klinger says there has been another fight between the Greek and the Turk. The Greek is not wearing a jacket. Scene 3 is from a different day than Scene 1.
Visible crew/equipment: As Margaret gets into the chopper, the lighting rigs, camera and crew are reflected in the canopy.
Continuity mistake: In the Commander's office, Frank's arms go from being in front of MacArthur's picture frame, to gone, and back again in a matter of a few seconds.
Other mistake: In the opening, when the flags were raised, the United Nations flag is hung upside down.
Continuity mistake: Private Rich's left boot is totally black when he's put on the chopper. When it goes up, it's worn to the bare leather, and back to new looking during the landing.
Audio problem: As Hawkeye and Trapper get into the chopper, you hear the engine powering up, and the blades slicing the air, but the blades aren't moving at all.
Continuity mistake: When Henry is put on the table, he rolls onto his back while requesting gas. After a cut to Hawkeye, he's on his stomach.
Character mistake: When Frank is berating Igor about the food on the trays, he calls him "Sergeant." Igor has always been a private.
Henry, Please Come Home - S1-E9
Continuity mistake: The message Radar is presenting to Henry goes from chest height on Henry to face height between angles.
Henry, Please Come Home - S1-E9
Visible crew/equipment: After Reveille has blown, Radar comes in, and gets items thrown at him. As the door closes, there's a reflection of the studio lighting on the glass.
Preventative Medicine - S7-E22
Continuity mistake: When Klinger enters Potters' tent, the bird alternates from about waist height to chest height between shots.
Aid Station - S3-E19
Continuity mistake: After Hawkeye and Trapper finish their toast to the Ritz Brothers, they toss their glasses over they shoulders. Trapper's flips in a lazy arc, and Hawkeye's in a flatter arc. When Radar is at the door, the glasses hit the door at a much higher speed and shatter.