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 mistake in Twenty-One Today
Starring: Melvyn Hayes, Windsor Davies, Don Estelle, Donald Hewlett
Trivia: Jonathan Ross appears in this episode as an uncredited extra, he's a soldier in the demob centre.