Continuity mistake: The display behind Klink changes. Sometimes, a map of the area around The Stalag, sometimes a layout of the the Stalag. Also, the picture of Hitler with the microphone bug. Sometimes there, sometimes moved, or gone completely.
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.