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Factual error: Bell's father was said to have been heavily in debt while establishing his business. He didn't establish the business. His father did. He inherited it.

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Factual error: The British general at the party in Cairo wears a beard. Beards had been against regulations for the British Army for decades at that time. No British soldier would wear one.

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Factual error: The Victoria Cross is said to be "only for fallen heroes", which is how Gertrude immediately knows that Wylie is dead. But one does not have to be dead to be awarded the VC; many people have survived to be awarded it.

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Factual error: The timeline is completely wrong. The film begins in 1902, at which point Gertrude Bell has just left Oxford and is about to go to Persia. In fact, Bell was 34 in 1902 and went to Persia ten years earlier, in 1892. By 1902 she had already been travelling for a decade.

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Factual error: The detective constable is addressed as "Sir" by uniformed constables. They actually hold the same rank. Detectives do not outrank uniformed officers in Britain.

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Factual error: The police car that shows up after the fight with the Deviant in London has a siren that sounds nothing like a British police siren. More like a Continental European one.

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Factual error: There is a billboard in London advertising a display of "artifacts" at the Natural History Museum. British English spells it "artefacts" and the Natural History Museum in London only holds exhibits on natural history. A display of artefacts would be at the British Museum, a completely different institution in a different part of London. (00:07:25)

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Plot hole: Burke is murdered so that Doward will be sent out to replace him, as both hold the same rate of CPO sonar operator. But there are many CPO sonar operators in the Royal Navy. How can the GRU be so sure that Doward will be the man chosen to replace him?

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Factual error: The Marine Engineering Officer on a submarine would be an experienced lieutenant-commander, not a young lieutenant.

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Character mistake: Robertson is usually referred to as Detective Superintendent, but sometimes as Detective Chief Superintendent.

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Factual error: As the Royal Navy has its own police (including detectives), there would be no need for a civilian detective to be airlifted onto a submarine, especially to investigate a sudden death that was not originally believed to be a murder.

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Continuity mistake: Kirsten is referred to as a DC (Detective Constable) in the first half of the series and then as a DS (Detective Sergeant) in the second half. As these later episodes include flashbacks to before the previous episodes, she obviously hasn't suddenly been promoted.

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Factual error: The coxswain, who is a warrant officer (as it says in the last episode), wears a chief petty officer's rank badge.

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Character mistake: The ship's doctor is sometimes addressed as "lieutenant surgeon" instead of the correct "surgeon lieutenant."

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Factual error: The ID cards for the chief petty officers all show them in junior rates' round hats and 'sailor suits'. CPOs (and petty officers) wear officer-style peaked caps and jackets and ties. It is unlikely that they've never had their photos changed since they were junior rates.

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Factual error: Some of the ranks are wrong. There are too many chief petty officers (and they're too young). The coxswain would be a warrant officer rather than a chief. The marine engineering officer would be a lieutenant-commander rather than an inexperienced lieutenant.

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Factual error: None of the naval officers wear medal ribbons. Even if none of them have been in a war zone (unlikely) or received an honour (also unlikely, especially given one is an admiral), the more senior would still have jubilee medals and the long service medal.

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Factual error: The insignia worn by the submarine crew is inaccurate, including the lack of a white patch behind the trade badges and a strange made-up version of the White Ensign. Also the Submarine service emblem of two heraldic dolphins has them facing the other way.

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Factual error: All four Hodgson children go to Enfield Grammar School. Enfield Grammar School is a single sex boys' school, so the two girls could not go there. In addition, grammar schools in England are secondary schools. While the two girls (aged 11 and 14) are of secondary school age, their younger brothers are of primary school age.

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Episode 4 - S1-E4

Continuity mistake: The captain (who holds the rank of commander) is in some scenes wearing four rank rings instead of the correct three he wears for the rest of the series.

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