Corrected entry: The whole story line is a plot hole. The blueprints would be a top secret item, and as such, wouldn't accompany the item they depict (in this case, missiles). Klink carries the prints around as if they were ordinary papers for no other purpose than to be "borrowed", copied, and returned by the Heroes. For this, Klink would have been eliminated.

Hogan's Heroes (1965)
1 corrected entry in season 5
Starring: Bob Crane, John Banner, Robert Clary, Werner Klemperer
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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'.
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Correction: Not a plot hole. The rationale for the plans being present was probably because they were to be presented to the assembled general staff. That makes it a deus ex, not a mistake. It's often stated in the series how the Axis general staff considers Stalag 13 a particularly safe place, so there's no reason not to take top secret plans there. As a matter of fact, the safety is precisely the reason the demonstration is held in Stalag 13. As for the reason Klink carries the plans with him, that's not a proper plot hole either. Again, viewed from the German point of view, the plans were safe there, especially rolled up where nobody could peek at them. After all, no prisoner had ever escaped from Stalag 13. Fact is, the Germans have no clue that Hogan's men have ways to get those plans out of country. True, Klink probably shouldn't have put the plans down, but that's just his usual clumsy self, and as already pointed out twice, from his point of view he had no reason to suspect duplicity.
Doc ★