Werner Klemperer and Leon Askin (Berkhalter) were also Jewish. Those guys sure had a good sense of humor.
Leon Askin was my favor actor in that series.
Wikipedia says that the actor who played Major Hochstetter was Jewish as well.
https://en.wikipedia.org/wiki/Howard_Caine
Werner Klemperer was a fine musician with a good singing voice. Here are Klemperer and Banner singing Silent Night in German.
https://youtu.be/ihYJpvRgpCM
Klemperer only took the Klink role on the guarantee that the character would come across as a bumbling fool.