David Jason claimed in his autobiography that "he loved that mouse", and being asked to carry the show "a real vote of confidence".
Baron Greenback's pet, Nero's sounds were made by recording David Jason laughing and talking gibberish, then speeding up the soundtrack.
When Dangermouse was shown in the US, the channel that screened it wanted the villain's accent to change from Italian to Cockney, because it might have offended Italian-Americans.
During the Gulf War, David Jason met someone in a pub who worked at RAF Command Headquarters. He told Jason they race 3-wheel vans against each other, paint them yellow with Trotters Independent Traders down the sides of them, like the van from Only Fools and Horses (1981); Jason went down to have a look, but he didn't see a race. Jason, Nicholas Lyndhurst and Buster Merryfield sent a Trotters van out to Kuwait. They slipped it into a Hercules plane among other stuff on a supply run and when it was unloaded the crew would find the van, filled up with chewing gum, toothpaste, cake and Dare dare motus (1981) and Comte Mordicus (1988) tapes from Brian Cosgrove with labels saying Debbie Does Dallas and Unzipperdedoodah and all sorts to amuse them. Jason didn't ask for any publicity because he didn't want anyone to think it was just for that, but a private joke between the RAF and the Trotters. The van was put in the hold and covered up with medical supplies and ammunition and flew to Kuwait, where it's discovery brought some light relief.