Episode #2.3 - S2-E3
Continuity mistake: The bullets on the table change positions during the scene after they stopped moving. For example, when Arthur moves the glass, you see 5 between him and the glass. In the next shot, you can't see any of the bullets, even though you see the same area. They're back when she flips the table.
Visible crew/equipment: An iPhone being held by someone is visible through a window in the top left of the screen during the decoy vehicle scene near the beginning of the episode.
The Company - S4-E6
Factual error: Tommy makes a call during the episode to the USA, there was no system for international calls in 1926 for the general public, that was only introduced in 1927. (00:33:30)
Factual error: Filter cigarettes weren't conceived until 1925 and not in common use until decades later. No self-respecting gangster would have smoked them.
Episode #3.6 - S3-E6
Factual error: Tommy says that the Chief Constable of Birmingham has issued a warrant for the arrest of Arthur, John, Polly and Michael. Only a magistrate or judge can issue an arrest warrant. The senior officers of the Metropolitan Police were sworn in as magistrates, but not those of other forces.
Factual error: Arthur is "deputy vice-president" of the Shelby Company Ltd. This is an American position title that would never, ever have been used in 1920s Britain.
Factual error: The on-screen caption when Aberama Gold is in Scotland reads "Glasgow." All we see is rolling countryside, without a city in sight.
Factual error: Several characters refer to "the London Times." It's never called this in Britain. It's just "the Times."
Episode #2.5 - S2-E5
Factual error: The Metropolitan Police officers who arrest Arthur in Camden Town are wearing the spiked helmets of the Birmingham City Police, not the boss-topped helmets of the Metropolitan Police, which we do see at other times.
Factual error: The Russian grand duke is called Leon Petrovna. Petrovna (daughter of Petr) is a patronymic used by a woman. A man would use Petrovich (son of Petr).
Episode #2.6 - S2-E6
Factual error: Tommy's warrant is signed by the 'Minister of the Empire'. There was no such post. The Colonial Secretary dealt with the British Empire.
Character mistake: Ada is listed on the portraits of The Company officers as Mrs Ada Shelby. She is actually Mrs Ada Thorne.
Factual error: Lord Stamfordham has a paper before him headed 'London Constabulary Police'. There was no such thing.
Factual error: Polly refers to Ada's soon to be born child as "the colour of a Hollywood Oscar." The first time that the statue was referred to as an Oscar was in 1939, so Polly saying that was 10 years too early.
Episode #2.1 - S2-E1
Factual error: Tommy refers to London at the south end of the Grand Union canal. However, the Grand Union in 1921/22 was what is now the Leicester branch. The Grand Union as it is known now was an amalgamation of 7 canals in 1929.
Black Shirt - S6-E2
Factual error: Sir Oswald Mosley is shown sitting in Parliament in 1933. He actually never sat as an MP after 1931.
Factual error: Throughout the show bottles of liquor have sprout dispensers attached to them. Sprout dispensers were not invented until the 1960s.
Episode #2.2 - S2-E2
Factual error: Tommy tells Churchill that he served at Verdun and several of Churchill's assistants say that they did too. There were no British troops at Verdun. It was a battle between the French and the Germans.
Episode #3.6 - S3-E6
Factual error: The locomotive used to pull the train is a LMS Black 5. This class of locomotive was not built until 1934, 10 years after the year this episode is set in. (00:32:25 - 00:32:55)
Episode #3.1 - S3-E1
Continuity mistake: At the wedding, Arthur leaves the table looking for Tommy and Grace, leaving his suit jacket. The next scene, he appears at Tommy's door wearing the jacket. (00:14:20 - 00:15:30)
Answer: There has never been prohibition in England. There are many reasons for running an underground distillery. It would be a way to avoid things like government regulations, safe distilling methods, alcohol content limits, taxation, fix pricing, and so on.
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