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Factual error: The word "intel", used several times, is first recorded in 1961. It certainly wasn't in use in 1918.

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Season 5 generally

Factual error: Throughout the season, it is the BND who run security investigations within Germany. The BND is the German external intelligence service. The internal security service, who would actually be running these investigations, is the BfV. Neither service has a power of arrest, which BND agents exercise on at least two occasions during the season. If they need to arrest somebody then they must call in the Bundespolizei (as they do correctly at other times).

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The Heart of Lord Trash - S1-E10

Factual error: Bulstrode refers to Elizabeth I. Since it's the 1930s, there's only been one Queen Elizabeth. She didn't become Elizabeth I until Elizabeth II acceded to the throne in 1952.

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The Heart of Lord Trash - S1-E10

Factual error: In the prologue, Captain Dance wears two and half rings of braid around his cuff. A British Army captain, which uniform he wears, wore two rings.

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Episode #1.5 - S1-E5

Factual error: The facility raided at the end is referred to as belonging to the Ministry of Defence. Although Churchill held the post of Minister of Defence, the ministry itself was not created until 1946.

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Show generally

Factual error: Although he is openly an SD officer, Huth does not wear the SD insignia on his cuff.

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Show generally

Factual error: ACC Pat Gallan wears the ribbon of the Queen Elizabeth II Diamond Jubilee Medal. The medal was issued in 2012. Her medals would be correct for 2017 when the series was made, but not 2007 when it is set.

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Episode #1.3 - S1-E3

Factual error: Dunn says he's researched at the British Library. It wasn't called that until 1973. Before then it was the British Museum Library and always referred to either as that or simply as the British Museum.

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Show generally

Factual error: Huth does not wear his Knight's Cross correctly. It should be suspended below the collar, not attached high on the collar as his is.

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Show generally

Factual error: Gruppenführer Springer wears the rank insignia of a Brigadeführer, the rank below.

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Show generally

Factual error: The constables working at Scotland Yard are wearing the divisional letter 'S'. 'S' Division covered North West London, including Hampstead, Hendon and Golders Green. Its men wouldn't have been anywhere near Scotland Yard.

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Part 3 - S1-E3

Factual error: At the picnic, a woman says she is going to New York by train. It is 1828. Railway passenger service in the United States did not begin until 1830 and it would not be possible to travel from North Carolina to New York until some years after that.

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Show generally

Factual error: Toby joins the War Office, handles statistics for the RAF (an Air Ministry job) and then is suddenly said to be working for the Admiralty, but still in the same office in which he has been working since the beginning of the war. These were three completely separate ministries with separate buildings. Civil servants joined one or the other.

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Episode #1.4 - S1-E4

Factual error: In 1940, all the Americans are leaving London on transatlantic flights. Although the first commercial transatlantic flights began in 1939, they were suspended on the outbreak of war. Real commercial transatlantic service did not begin until after the war.

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Episode #1.4 - S1-E4

Factual error: Toby works in the War Office, which is collating all the RAF's losses. The War Office only administered the Army. The RAF was administered by the Air Ministry.

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Episode #1.3 - S1-E3

Factual error: Billy is called up into a specific unit of the Royal Artillery. This didn't happen. He would first have been sent to a Royal Artillery training depot and only after training would he have been assigned to a unit.

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Show generally

Factual error: The Prince Regent's servants address him several times as 'Your Majesty'. Since his father, the King, is still alive he is actually 'Your Royal Highness'. No royal servant would make this mistake.

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Show generally

Factual error: Several of the soldiers at the Tower wear their hair tied back in queues. These were abolished in 1808 and the series is set in 1814. Since they were loathed as well as against regulations, it's highly unlikely that any soldier would have worn them after they were abolished.

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Episode #1.7 - S1-E7

Factual error: Lorna uses the word 'okay'. The first recorded usage of this word in America was not until 1839 and in Britain not until the 20th century. The series is set in 1814 and generally uses language contemporary to its setting.

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Season 2 generally

Factual error: Both detective superintendents always wear uniform, which is only worn by detectives on very formal occasions if at all. Both also wear collar badges, which are not worn by either the Metropolitan Police or Thames Valley Police, the forces to which they belong.

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