"I really needed to dramatize and clarify that Rachel was taking strides towards her own healing and her own sobriety - and that she was actually thoroughly frightened about what she may have done.This was something that was so beautifully done in the book [The Girl on the Train] through inner monologue, but I couldn't just have a whole film filled with inner monologues. So going to Alcoholics Anonymous was a very simple solution to that problem."

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I was every Londoner's stereotypical idea of a brash, vulgar American. When I got here, it turned out that London was the Wild West, and New York was like London at the height of the Victorian era, in which everyone was far more obsessed with table manners and status-climbing than they are in London. In London, everyone was just crawling over this blizzard of cocaine. Here, if you have more than a glass of wine with your meal, people refer you to Alcoholics Anonymous.

— Toby Young