Yes, Minister (1980)
0 revealing mistakes in show generally
Starring: Nigel Hawthorne, Derek Fowlds, Diana Hoddinott, Paul Eddington
Genres: Comedy
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Deliberate mistake: In the scene where the ministers are all crammed into the train carriage if you look over Jim's shoulder there is a sign ("Notice" "In case of Fire" etc), while the headers are in English the actually paragraphs are written in gibberish.
Sir Humphrey Appleby: It's always a victory of the heartless over the mindless.