Stupidity: The plans Hochstetter and Burkhalter find in Hilda's desk turn out to be for the Hindenburg, a large dirigible. Burkhalter says he never saw the plane (sic) they show before. The Hindenburg was a German propaganda icon and very well known to every child in Germany. It's nigh impossible a Luftwaffe (Air Force) general would not recognize plans of a dirigible when he saw them, or not know the Hindenburg. Note that despite everything, the plans from Hilda's desk are probably meant to be not the same ones Carter later says he found inside the boxes - A Luftwaffe general not recognizing the difference between a jet plane and a dirigible is even more stupid. To avoid unnecessary corrections: Yes, according to the boxes the kits aren't for the Hindenburg but for JU-87 Stuka bombers, but that's a different mistake and not relevant for this one.
Hogan's Heroes (1965)
1 stupidity in season 4
Starring: Bob Crane, John Banner, Robert Clary, Werner Klemperer
Klink for the Defense - S6-E19
Continuity mistake: General Burkhalter is eating Klink's dinner. When finished he places a metal cover over the plate. In the next shot the cover is lying on the table and there is extra food on the plate. (00:15:25)
More quotes from Hogan's Heroes
Trivia: During WW2 Robert Clary, who played Louis LeBeau, had been imprisoned at Drancy internment camp in France, and at Buchenwald Nazi concentration camp where he was tattooed with the number "A5714." He was the youngest of 14 children. Twelve members of his immediate family were sent to Auschwitz, and perished.
Question: What exactly is the "cooler"?
Answer: It's a solitary cell. Steve McQueen, star of 'The Great Escape' is known as the 'Cooler King'.