The original painting of The Fallen Madonna with the Big Boobies, which features in many episodes, was given to production designer Shaun Moore after the series ended in 1992. In April 2007, he auctioned it for £4000 to raise money for the charity the Ace Centre, which helps children with communication problems in Oxford.
Lt. Gruber's armored car is a SdKfz 222, the Leichter Panzerspahwagen, or translated, light armored reconnaissance vehicle, a 4x4 car produced between 1935 to 1944.
Writer David Croft says that the inspiration for Officer Crabtree, the policeman (played by Arthur Bostrom) who speaks spectacularly bad French, came from Edward Heath, former British Prime Minister, who spoke French with a broad English accent. In real life, Arthur Bostrom speaks French fluently.