It's not easy being Sherlock. More precisely, it's not easy being the men behind the BBC1 show, Steven Moffat and Mark Gatiss, after fans took issue with some "elementary errors" in its eagerly awaited new episode on Wednesday night, reports the Daily Mail. With much of the action set on the London Underground, viewers took to Twitter to point out that various train journeys and station settings did not match the reality of the tube network. "As the pair enter Westminster station, which is served by the District, Circle and Jubilee lines, they are inexplicably show walking past a sign for the Northern line," reports the paper. Whatever next? That the whole thing is in fact, like, make believe and not only is Benedict Cumberbatch not actually Sherlock Holmes, but Sherlock Holmes didn't actually exist? What? And if Una Stubbs is their landlady, why doesn't she ever reminisce about the days she spent with Worzel Gummidge? Plus, I thought Tim from the Office got it together with Jasper Carrott's daughter? So who's that other love interest then? What happened to Dawn the receptionist? If I ever find out they don't actually film it in real time, in a single 90-minute take, I am never going to watch again. (Real fact fans – the tube train they end up in wasn't a real tube train at all, but built entirely from scratch.)