Yes, Minister (1980)
0 deliberate mistakes in show generally - chronological order
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.
Bernard Woolley: That's one of those irregular verbs, isn't it? I give confidential security briefings. You leak. He has been charged under section 2a of the Official Secrets Act.