Continuity mistake: On the way to catch Trapper, Hawkeye and Radar are stopped by an MP checkpoint. After bluffing the MP with a story about neuropraxia, the MP pumps his fist in the air saying "Move out!" The camera cuts to a wide shot and the MP is starting to pump his fist in the air again, and says "Move out!" again.
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Plot hole: In this episode, the military money, or scrip, is being called in and exchanged for a different color (and assumedly design - otherwise counterfeiters could just keep using their printing plates) to battle counterfeiting. However, in previous episodes several colors of scrip are being used equally and at the same time - e.g. in episode "Hey, Doc" (4-5), Sgt. Kimble collects a pot consisting of both blue and tan one-dollar scrip notes. No previous indication was given in the show that the army started a practice of using just one color at a time.
Continuity mistake: When Klinger refuses to give Winchester the letter from his sister, Winchester screams at him, Klinger jumps and falls to the ground next to Winchester's bunk. After the cut, Klinger is sitting next to Hawkeye's bunk (note the airplane seat in the background instead of the door) and Winchester is holding the letter in his hand opening it. Rightfully it should be on the floor next to Winchester's bunk. If you look closely, you can see it flying out of Klinger's hand towards the door.
Revealing mistake: When Radar carries the field phone from Col. Potter's desk over to Hawkeye who is squatting in the corner, the phone doesn't have a phone line attached. It is an EE-8 Military Field Phone, which is a wired device, not a radio - even if Radar elsewhere says he has somebody "on the radio" when in fact he is using an EE-8.
Revealing mistake: When Radar walks into the supply room, he carries four or five ammunition belts around his neck. Since he stows them in the gun bin, it has to be assumed that they are not meant to be empty. If they were only half filled each, he would still be carrying something in the area of 60-100lb. However he moves with absolutely no visible strain and tosses the belts into the gun bin with ease. Elsewhere in the series Radar is depicted as being none too strong. Clearly the magazine pouches were stuffed with something light and the effect carrying the real weight would have on Radar was overlooked.
Continuity mistake: When BJ arrives in Korea, he, Hawkeye and Radar are attacked by guerillas while changing a flat tire on their jeep. After installing the spare tire from the back of the jeep, Hawkeye rolls the flat tire off the to the side of the road and jumps into the jeep as Radar speeds off. Later, when they reach the camp, the spare tire has reappeared on the back of the jeep.
Continuity mistake: When Radar calls assembly, the very first shot shows some troops appearing on the parade ground. Klinger, in his straw hat, appears on parade in the front rank in the top right hand corner of the screen and stands to attention. In the next shot, however, he is seen approaching the parade ground at the double from the Post Op ward building. Next shot, he is on parade, but in the centre of the rear rank. A couple of shots later, when Major Burns addresses the troops, he is back in the front rank - screen top right. This position is confirmed later when Burns addresses him by turning his head sharp left (he is facing the parade), and Hoolihan is seen marching over to him to remove his hat.
Other mistake: After being loaded with wounded, an ambulance accelerates, turns left and moves out of sight. Immediately after there is the sound of a crash, and the ambulance is lying on its left side. Radar states that it turned too fast and rolled over...but in that case, it would be on its right side.
Deliberate mistake: BJ mentions to Charles that if they don't sign the armistice it will be the second time in 2 years and then he will miss his daughter Erin's second birthday. This is BJs 7th season and when he arrived at the beginning of season 4, Erin was already born, making it absurd that seven years later she could still be one year old. Because the real war lasted 3 years and the show 11, there are obviously some errors like this that can't be avoided but this was blatantly egregious.
Other mistake: While celebrating the ceasefire, a Jeep full of people including Father Mulcahy stops between the Swamp and the main building. There's a streamer hanging down either side of Mulcahy from above the top of frame. Unless there's a power line to the Swamp that never appears at any time, there's nothing for it to hang from.
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Revealing mistake: When Hawkeye and Margaret turn toward the stove, and he says "Are you hungry?", watch the can. Though it is meant to look like it blew the top off, it is plain that the top was just set into the top, and a blast of air was used to blow it open. This is because of the sound, and a stream of vapor that often accompanies a blast from an air gun. A sealed can set on a heat source would have burst not only from the top, but also from the side at a seam, or the bottom. Also, they were about five feet away from the can, and the beans went up, not out at a ninety degree angle. So they wouldn't get beaned. Beans on the face were for comic effect.
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Continuity mistake: When BJ, Hawkeye and Radar are being shot at, they hurry to get in the jeep. Radar gets out to get the jack, and salutes it. When the camera cuts to a shot of Radar getting back in, the jack is magically gone. It doesn't appear again.
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Continuity mistake: When the Champ falls forward, he gets wine all over his sweater - you can see it when Potter and Hawkeye lift him. After the cut, his sweater is clean again. Considering the position of the stains relative to Hawk's hand, at least some stains would be visible.