Nobody's Perfect

In an early episode Henry called his wife Mildred later she became Lorraine.

Hawkeye said he was an only child and that his mother was dead, but in one episode he ends a letter home with 'give my love to mom and sis'

When Radar gives Col Potter a horse he says it is male, but Potter calls the horse Sophie.

In one episode Radar is seen showing Henry his new tattoo, later in the series Hawkeye persuades Radar not to have a tattoo.

In the episode 'A War For All Seasons' Col Potter is seen at the end of 1951 but he didn't arrive at the camp until Sept 1952.

Henry was given a discharge because he had enough 'points' but the points system wasn't used for doctors in the Korean War.

The 'Godzilla' series of films were often mentioned in the show, but they weren't actually made 'till after the Korean War. "The Blob" was also mentioned but this wasn't made until 1958.

In the episode "Movie Tonight" Radar did an impersonation of John Wayne. The impersonation he did was a quote from the movie "Mclintock" however, the movie wasn't made until 1963, ten years after the Korean War ended.

In an early episode Margaret says her father is dead, but later in the series he visits the camp.

In his first appearance, Sidney Freedman is referred to as Milton Freedman.

In "Bulletin Board" there is a tug-o-war. Hotlips falls into the mud pit, and Hawkeye falls in after her. You can see Loretta Swit mouthing "Ow, Ow!" and looking as though she's in pain. Then you can see Alda mouth "Loretta, it's OK, it's OK" are they're both laughing along with everyone. Of course none of this can be heard, as the sounds of the cast laughing and acting crazy are dubbed over the scene.

In the episode "Depressing News". Alan Alda and Mike Farrell are walking into frame in the scene where Hawk and B.J. discover the huge shipment of the depressors, Alda's feet are visible for about 2 seconds and he has bright blue early '80s trainers on!

In one episode people can be seen drinking from beer cans that are clearly all-aluminum cans, an invention of the early 1970s!

In "The Is Nothing Like a Nurse" there are a few scenes where Trapper and Hawk are in the officer's club having a drink. I believe it's the first scene of them at the bar in which this blooper occurs, right after Hawkeye gets the "arid" martinis. Trapper is talking to someone on the left of the screen (who it is escapes me right now) and Hawkeye is sitting on the right of the screen, on the edge. As Trapper is talking to the other person, Hawkeye sips the martini. As he does so, he spills some! You can actually see it on the bar. Alda nonchalantly looks down at his spill and Trapper's STILL talking. Before it's time for Alda's line he casually wipes his lips/chin off, as I'm sure some of the spilled martini got on him.

Both Radar and Klinger are quoted as having 2 different army serial numbers.

In the "The Price of Tomato Juice" when Frank asks Igor his name he replies Maxwell. Could this be Jeff Maxwell forgetting his characters name.

In "Der Tag" Radar is seen with an Avengers comic which wasn't around until the sixties.

In "Sometimes You Hear The Bullet" when Henry presents Frank with a "Purple Heart" (earring) he calls him Franklyn D. Burns but Franks middle name is Marion.

In "I Hate A Mystery" two rather subtle goofs occur:

Early in the episode, Frank calls Hotlips "Major Houlihand"! Freudian slip...? You decide.

McLean Stevenson has a bit of a quiver to his voice the first time he orders Hawkeye to open his footlocker... perhaps Alda's laughing was breaking him up. I also think he's grinning quite unseriously/unmilitarily, but luckily for him, the soot makes it difficult to tell! Gary Burgoff seems to also be giggling a little, but I can't tell if, as Radar, he was merely being amused by the situation. He appears to be trying to stifle his laughter, but he might just be acting as Radar might... not wanting to laugh at Henry.

In "Potter's Retirement", at the Kentucky derby party, Alan Alda is sitting on a sawhorse. Everyone cheers about something, and Alda nearly falls off the horse, taking the saddle with him! But, he catches himself just before he falls. 

The the episode "The Light That Failed" Klinger had to steal a light bulb from above Potter's desk, because they had no others. Yet only a few scenes later, Potter had one above his desk and the supply truck had not arrived yet?

In one episode Winchester commented, "Montana, the Big Sky Country." Yet for the Korean War and many years after, Montana was known as the "Treasure State." The "Big Sky Country didn't come along until after Guthrey wrote the book in the 60's.