I find it interesting that four of the cast members were German/Austrian/French Jews who escaped Europe during the war, such as Werner Klemperer, John Banner and Robert Clary that we see in this video. The first two agreed to play their parts just so they could make fun of the Nazis. Another was Leon Askin: https://en.wikipedia.org/wiki/Leon_Askin
The only cast member still alive is Robert Clary. His 92nd birthday is March 1st.