Character mistake: As Stauffen parts company with Col. Hogan at the road checkpoint, he salutes Hogan. While that is understandable under the circumstances - after all Hogan just saved his life, it would also be highly suspicious. Both Schultz and Stauffen's adjutant were watching them, so it can't be said they did it surreptitiously either. After all, Stauffen is a German general whereas Hogan is an allied prisoner officer of inferior rank. For an officer of higher rank to initiate the salute is a demonstration of great respect and/or thanks, which, as far as anyone besides Stauffen and Hogan knew, was not warranted in this situation.

Hogan's Heroes (1965)
1 character mistake in Operation Briefcase
Starring: Bob Crane, John Banner, Robert Clary, Werner Klemperer
Trivia: When Klink is begging Hogan to trade places with him for fear of assassination, he says to him something like."I want to live til 80...all my family has lived til 80." Werner Klemperer, who played Klink, passed away in 2000 aged 80.
The Antique - S5-E12
Question: When Hogan gives Klink $100 for the cuckoo clock, the bill handed over was a crisp American $100 note. How did Hogan get an American $100 note? At best, in this time period, he should only have Reich Marks. And how would he have 333 Marks, 33 pfennigs? Unless he had a side businesses going, this seems unlikely.
Answer: Werner Klemperer fled Nazi Germany as a teenager. His two conditions for taking the role of Colonel Klink were that he had to be a bumbling idiot and he always had to lose. It would then be a character mistake that if Hogan offers him a fresh American hundred-dollar bill, he's not going to ask questions, he's going to take the deal. The fact that he's Commandant and could just confiscate the money from Hogan would never occur to him because, again, he's a bumbling idiot who, by the actor's contract, always has to lose.
Chosen answer: Hogan and his men are running a spy ring out of the camp, they have access to supplies from outside. (In another episode, they have to convince a defecting German officer that they're legitimately working for the Allies by arranging a specific personal ad to run in the next day's London Times, so a new $100 bill is not beyond their capabilities).
Answer: Rightfully, Hogan should not have any money at all. POW were stripped of all cash they carried. The intention was to make escape more difficult. The fact that Hogan has what is the equivalent of a third of the price of a KdF-Wagen (You'd probably know it as a Volkswagen Beetle) in cash should rightfully make Klink more than a litle suspicious.
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Answer: It's a comedy, not a documentary.
stiiggy
Perhaps it was counterfeit. There are numerous episodes where they deal in counterfeit monies.