Among the recurring characters who appeared on the show were female French resistance fighter Tiger (played by Arlene Martel), Marya the White Russian (played by Nita Talbot) and the bumbling R.A.F. officer Colonel Crittendon (played by Bernard Fox).
Another recurring character was Burkhalter's sister Frau Gertrude Linkmeyer, usually played by Kathleen Freeman, but on one occasion, in the fourth year, by Alice Ghostley, who also appeared in a final season episode as the wife of a Nazi field marshal.
Larry Hovis, Sgt. Andrew Carter, refused to remove his wedding ring for the series. He wore gloves for the majority of his performance (although there were occasions when the ring was visible).
The character of Sergeant Schultz, prior to the war, had been the president of a successful toy manufacturing company. Colonel Klink had previously been a bookkeeper.
Although the show was a hit in syndication in Germany, certain liberties had to be taken. It's illegal to say "Heil Hitler" in Germany today (and is considered bad taste), so when the German soldiers gave the party salute, the characters said, "How high is your corn?" The absurdity of it all was especially funny to German viewers. Also, anytime the show alluded to actual bombing and killing, the dialog there was modified as well. For instance, when the Americans destroyed a munitions factory, the German version made it a toilet paper factory. And when Sgt. Schulz reported the Allies having bombed Hamburg, it was revised to the Royal Air Force dropping planeloads of candy as a "propaganda maneuver".
The show was still very popular in its final season on the air. However, it was caught up in the "rural purge" that took place just before the 1971-1972 television season. The main reason it was canceled was due to the fact that it was felt that the show mainly appealed to rural audiences and older people in much the same way that shows like The Beverly Hillbillies, Green Acres and Hee Haw were.
Richard Dawson auditioned for the role of Hogan, but lost to Bob Crane. This led to friction between the two actors and when Crane was killed in 1978, Dawson did not attend the funeral.
The set of Stalag 13 was built on the spot where the plantation house Tara once stood in Gone with the Wind - on the 40-acre back lot at Culver City that was also home for Mayberry in The Andy Griffith Show and Camp Henderson in Gomer Pyle, U.S.M.C..
Early in production planning it was decided to make it always be winter with snow on the ground and frost on the windows. This was to prevent problems with continuity and to allow the episodes to be shown in any order. Since much of the filming was done in the summer the actors had to wear coats and act cold even when the temperature was over 90 degrees F.
General Burkhalter's staff car was actually an American hybrid with a Mercedes Benz logo on it. Col. Klink's staff car was a 1936 Mercedes 260D, although in some episodes it was the Pullman limousine model while in others it was the standard model.
Ivan Dixon ('Kinch') left the series at the end of the fifth season (the only regular cast member to do so), stating that he was fed up with the posturings of Bob Crane, Werner Klemperer and Richard Dawson. He was replaced by Kenneth Washington for the final 24 episodes. Also, there was no mention of what happened to Kinch following Dixon's departure.
Despite some coincidental similarities (both have a "Sgt. Schultz" and a somewhat put-upon commandant), "Hogan's Heroes (1965)' was not inspired by the movie Stalag 17.
For the first several seasons the "snow" on the roofs and on the ground was actually salt. By the fourth season much of the snow on the roofs had been replaced by patches of white paint. By the sixth season all the patches of snow on the roofs and many of the patches of snow on the ground, especially in the high traffic areas, were also just paint.
For the first five seasons Carter wore a distinctive leather flight jacket. The right sleeve and part of the front was white. This jacket was replaced in the sixth season with one that was all brown.
The Stalag 13 outdoor set was located at the NW corner of the Forty Acres back lot in Culver City, CA. After the series cancellation, the set was used as Medical Camp 9 in the Nazi sexploitation thriller Ilsa: She Wolf of the SS. It was also used in the Mission: Impossible episode "Trial By Fury" where it doubled as a South American prison. The back lot was bulldozed in 1976 and is now an industrial park. The location was previously used for the Tara plantation facade in Gone with the Wind.
The car seen leaving the camp in the opening credits and from time to time during the series is a Mercedes model G4 Parade Car. The six-axle vehicle had four wheel drive (6 x 4) and was popular among the German Military elite.
The sign outside Barracks 2 says : "Verboten: 1. Strict orders have been given to the German Troops around Brussels to shoot any civilian cyclist. 2. People who, after the fifteenth of December, are still in possession of carrier pigeons as well as other persons who, by signals or any other means, cause annoyance to German military interests will be judged by court martial." It is dated December 13, 1944 and signed by General H. Heinrichs (who shares the same initials as the show's art director Howard Hollander).