Continuity mistake: In this episode Gunner Parkin celebrates his 21st birthday, but in the second episode of series 1 Parkin's medical record says he was born on 2nd October 1925. This entire programme is set in 1945.
It Ain't Half Hot Mum (1974)
1 continuity mistake in season 4
Starring: Melvyn Hayes, Windsor Davies, Don Estelle, Donald Hewlett
Continuity mistake: In "Twenty-One Today" (4-8) Williams says that he grew up in an orphanage and didn't know who his parents were, but in this episode he says that his father was a coal miner in South Wales.
Trivia: Jonathan Ross appears in this episode as an uncredited extra, he's a soldier in the demob centre.