Trivia: Secret Army
- Hey, It's That Guy!:
- Watch carefully and you'll see a few actors from 'Allo 'Allo! appearing in series 2 and 3.
- Anthony Head also appears as a young German officer and John Ratzenberger as a Canadian Sergeant.
- Captain Durnford and Major Bradley were brothers Malcolm and Donalbain (respectively) in Roman Polanski's 1971 film of Macbeth.
- Missing Episode: "What Did You Do During the War Daddy?" was the final filmed episode. Supposedly pulled due to a strike at the BBC, it was supposedly actually pulled due to concerns of dodgy old age make up and whether its revenge seeking and anti-communist tract was out of place with the tone of the rest of the series. Set 25 years after World War II it concerns the characters being interviewed for a TV series. The episode was not featured in the DVD boxed set and most interviewed cast members felt it was right to pull it. Clips sometimes appear on YouTube.