Trivia: During WW2 Robert Clary, who played Louis LeBeau, had been imprisoned at Drancy internment camp in France, and at Buchenwald Nazi concentration camp where he was tattooed with the number "A5714." He was the youngest of 14 children. Twelve members of his immediate family were sent to Auschwitz, and perished.
Trivia: A sinister aspect of an otherwise lightheated comedy, but the fact is that Hogan and his men are war criminals. They engage in combat activities behind enemy lines when not in uniform, and worse, while wearing enemy uniforms. The Germans tried that during the Battle of the Bulge and those arrested were shot.
Trivia: As Newkirk does his impressions, he says "Sprechen Sie Deutsch?, Ja! Then droppen sie dead." This joke was used in "Stalag 17", the 1953 movie about POWs in a German prison camp. The exchange was between Harry Shapiro and their guard, Johann Sebastian Schultz.
Trivia: The ever-present helmet on Klink's desk and in the opening and closing credits is a "Pickelhaube" (pronounced pickle-how-be). It was originally a Prussian helmet design that later spread throughout the German Reich and beyond. It quickly became a symbol of Prussian militarism and hints at Klinks military career in the 1st WW. The spike on top was supposed to deflect a sabre blow from an enemy. The ones on the desk are the 1915 model, identified by it's easily detachable tip. Since it was inadequate in a modern combat environment - it was made from leather - it was succeeded in 1916 by the nowadays equally iconic Stahlhelm.
Trivia: When the show was translated to German, the producers feared that some of the more patriotic lines of Klink would be too nationalist for the bruised German sensibilities. As a result, whenever Klink starts talking patriotic drivel in the original, in the German he starts rhyming nonsense rhymes or talks about his housekeeper and (secret) affair "Frau Kalinke" which does not even exist in the original.
Trivia: This is not really a plot hole but more of a plot device: The episode revolves around using the unsuspecting Klink as a courier by hiding secret information in his belt. This episode however is the only time in the series Klink wears a belt on his coat. In all other episodes, he doesn't wear one.
Trivia: As Major Zolle digs, Kinchloe tells the other prisoner "You may fire when ready, Gridley!", which the man turns on the water. The line was originally an order given to Captain Charles Gridley by Commodore George Dewey during the Battle of Manila Bay, May 1, 1898, and has been used numerous times over the years.
Trivia: The idea was for the series was to always be winter, so that the episodes could be shown in any order, hence the reason there is always snow on the roofs and ground, and frost on the windows. In fact, the filming was mainly done in summer, with temperatures in the 90s, and the actors had to wear their coats, and act as if it were cold.
Trivia: When Carter first goes into the bar, the Artillery Private he speaks to is played by William Christopher, who, besides a couple of other spots in the series, is better known as Father Mulcahy at the 4077th Mobile Army Surgical Hospital, or M*A*S*H.
Trivia: As Hogan dangles the key in front of Klink to remind him of the promise to look the other way, Klink borrows one of Schultz's gags in his last line of the scene, saying, "For the first time since I have taken command here, I want to know nothing! NO-THING!"