Hogan's Heroes was also a great showcase for some of the best character actors around: Noam Pitlik, (who was in the B&W HH pilot), Frank Marth, Henry Corden, Ruta Lee, Parley Bear, (Mayor of Mayberry), Arlene Martel, (Spock's Vulcan wife and Tiger on the HH series), Gavin Mcleod, (the Love Boat Captain and McHales Navy and Kelly's Heroes star after losing much weight).
William Christopher, (Father Mulcahey on MASH) also substituted on many episodes as one of the heroes when one of the cast was absent.
The set in Culver City, California, known informally as the "40 Acres", was also used for Gone with the Wind, (Tara), The Andy Griffith Show, Gomer Pyle, USMC, Superman and countless other movies and TV shows. The set no longer exists and is buried under an industrial park today.
http://www.retroweb.com/40acres.html
BTW, there really WAS a Stalag 13 outside the Town of Hammelburg in Bavaria. It still exits today as a modern military base. This is the stalag Patton ordered a raid on to free his son-in-law. A rescue which turned into a disaster for the rescuers.
http://en.wikipedia.org/wiki/Task_Force_Baum