When BJ says, "What am I supposed to do, sit up and beg?" to Margaret in the Swamp, he's looking at her and holding out the finger he nicked with a needle. When Margaret moves to sit beside him in the very next shot, he's looking down at the sock he's mending with both hands.
Just before Father Mulcahy enters the Swamp to return the ledger to Charles, he can be seen outside in the gap between the door and the door frame waiting for his cue to enter.
When the North Korean soldier is covered after he dies, his eyebrows move.
The wrapper of the Hershey bar given to the wounded North Korean soldier has a UPC bar code, but bar codes were not introduced until the 1970s.
As Klinger is passing out Hershey chocolate bars to the patients, the back of one bar shows a UPC bar code. Bar codes were not introduced until 1973.
Charity collection time is every month on pay day. Considering how long the officers have been there, they all should have heard of it, and participated as collections officer at least once. Yet they all act as if it is something new and they don't want to have anything to do with it.