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)
Episode #3.1 - S3-E1
Continuity mistake: When Michael and Charlotte are alone together, the size of the flame on the candle differs depending on who is in shot.
Episode #3.2 - S3-E2
Continuity mistake: John and Polly are talking in his office. He is wearing a ring on his left hand, then a few seconds later he is not.
Episode #3.4 - S3-E4
Continuity mistake: The show opens with an elk grazing, a shot is fired and a deer falls dead on the ground. The antlers are different - not those of an elk. (00:00:20)
Episode #3.6 - S3-E6
Continuity mistake: Michael picks up the cash from the table. After Polly speaks to Tommy she turns around to take the money out of Michael's hand; in the shot Michael is holding the cash in his lap with his jacket off, but when Polly takes the cash it shows her hand taking the money from Michael with him wearing his suit.
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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