Episode #4.1 - S4-E1
Character mistake: Ruth tells the Oxford professor that she read "Classics" at Oxford. That's a major mistake - Oxford doesn't offer "classics" as a course: it is called "Greats" (or "Lit Hum"), and is referred to as such by the students reading it. It might be one thing for an Oxford alumnus to call it "Classics" when speaking to someone not at Oxford, but they would never say it to a member of the Oxford faculty.
Episode #9.3 - S9-E3
Character mistake: Tariq says "I ran a probability logarithm." This makes no sense: it should be "a probability algorithm." (00:17:35)
Episode #4.4 - S4-E4
Character mistake: A computer screen giving details of the villain of the week contains various spelling and grammatical errors: "Embassey", "Assination" and "Assination of with".
Episode #4.1 - S4-E1
Character mistake: Ruth requests a search of London streets with the name "Achilles" in them. A list of streets appears on a computer screen, but when one of them is selected, it is spelled "Achillies."
Answer: The shots of the tube station closing and the shot of the concourse were shot at Marylebone station. There is also a shot of the tracks in which a sign is visible pointing to Southwark station and the Jubilee Line, and I suspect this is a stock shot filmed at Waterloo station.
Sierra1 ★