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 Bombsight
Starring: Bob Crane, John Banner, Robert Clary, Werner Klemperer
Hogan Gives a Birthday Party - S2-E1
Continuity mistake: The footage of the bomber's nomenclature Hogan and his men commandeer switches several times from during the takeoff, the bombing run, then the end of the bombing run - three different types of planes.
Trivia: A sinister aspect of an otherwise lightheated comedy, but the fact is that Hogan and his men are war criminals. They engage in combat activities behind enemy lines when not in uniform, and worse, while wearing enemy uniforms. The Germans tried that during the Battle of the Bulge and those arrested were shot.
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 ★