It Ain't Half Hot Mum (1974)
0 continuity mistakes in season 1
Starring: Melvyn Hayes, Windsor Davies, Don Estelle, Donald Hewlett
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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.