As a child a lot of things went over my head in that historical documentary.
1) Germans regularly separated officers from non-coms an privates and each had their own camp. As a colonel, Hogan would not be mixed in with the NCOs.
2) Germans segregated prisoners by nationalities (no Newkirk or LeBeau). However, there was a yank in the RAF who because he was in the RAF was housed with other RAF officers.
3) Hogan could not just walk across the yard and into the Kommandant's office. That would be outside the prisoner compound.
4) Way too much food. Prisoners weren't well fed and unless they bartered with the guards, could not get eggs to make crepe suzette.
5) There should be two rows of wire with a dead line before the first wire. We had the same dead-line practice during the American Civil War but it was marked by a very low fence made of wood.
I didn't learn those things until I read accounts by captured men. If held captive by the Americans in America, the Germans had it GOOD.
John Banner who played Schultz was an Austrian Jew who served in the US Armed Forces during WW II. There's a video of him aand Kempeler singing Stille Nacht in German together.
BTW, I saw Werner Kempeler (Col. Klink) when he narrated for a performance by the San Francisco Sympthony.