Continuity mistake: When Klink is talking to Schultz, his monocle is in before he bends down, missing when he's looking at Schultz, and back when he straightens up.
Continuity mistake: As Schultz is going to get checked out, Hogan and the boys stop him, and Hogan feels Schultz's neck. Schultz's arms are by his sides, then after the angle change, they're by his hips. Also, there's two men walking behind the group that weren't there a second before.
The Most Escape-Proof Camp I've Ever Escaped From - S2-E26
Continuity mistake: In the beginning, Carter's hair has been buzz cut. A few minutes later, it's back to regular length.
Audio problem: After Schultz discovers the boys in the cannon plant, Hogan lifts a cannon up and taps the metal inside. If you watch closely, he only taps three times, but there are four tap sounds.
Heil Klink - S2-E22
Continuity mistake: In the beginning, Carter and Newkirk are wiring in the explosives. As they run the spool of wire, first it unrolls clockwise, then counter clockwise between shots.
The Rise and Fall of Sergeant Schultz - S2-E6
Continuity mistake: After Klink and Schultz chat, Klink offers him a cigar. When holding the box open, Klink's hands shift positions a couple of times.
Anchors Aweigh, Men of Stalag 13 - S1-E16
Continuity mistake: As Klink comes out to see the Officer's club, you can see Hogan is on the ground, and Kinchloe is on the boat by the shade. After a quick close up on Hogan, Hogan's suddenly on board, and Kinch has disappeared in a second.
Continuity mistake: At the end, while Hogan and Klink are talking, Hogan's right arm alternates between being up with a note in hand to down at his side between shots.
Other mistake: Carter said the plans and note were in the box that was supposed to contain a model of the Hindenburg. However, the box he's building out of has "STUKA" on the side.
Visible crew/equipment: When the radar truck comes into the camp, as it slows, you can see the lighting rigs for the cameras.
Will the Blue Baron Strike Again? - S4-E12
Continuity mistake: When Hogan is listening to Kinch, his overcoat is open. When camera cuts from him to Newkirk and Kinch and then back, Hogan's overcoat is shut.
Continuity mistake: In the lobby, Morrison has his gloves on, and never removes them. When he reacts to the gun shot, the gloves are gone.
Continuity mistake: Metsker never removes his right glove, as it is visible in all close ups. In the last wide shot, his glove is suddenly in his left hand.
Continuity mistake: When Klink is talking with the doctor, he sits while reading the report. One moment, he's holding the folder, the next, his hands are folded without having dropped the folder.
Everyone Has a Brother-in-Law - S2-E23
Other mistake: When the boys are listening on the coffee pot, the red light to indicate power is not lit.
Other mistake: When the boys are listening to Klink's office, the lid is on the speaker instead of being off.
Continuity mistake: When Newkirk brings his hat loaded with candy, he hands it to Hogan with the badge on the top on Hogan's left. When the camera angle changes, the hat has been reversed.
Audio problem: As the baby tank runs by the group in a wide shot, you see Hogan's mouth moving in a conversation, but the words don't match up.
Revealing mistake: As Hogan goes through the hole to the ladder, the "rock" he brushes against flexes for a second. Likewise, when Kinch climbs through, the "rock" under his hand flexes and mashes down as his weight is on it.
Answer: It's a comedy, not a documentary.
stiiggy
Perhaps it was counterfeit. There are numerous episodes where they deal in counterfeit monies.