"Allison Janney is the best actor on the series.Allison is one of the few actors I ever worked with who is incapable of hitting a false note."

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I needed to enhance the outward threat to Rachel.In the book [Girl on the Train], her inner threat is so strong; the fear of herself and her inability to remember and the false memories. In the film [Girl on the Train]I wanted to increase the exterior threat. So that's why Allison's part was bigger and was an important part of the climax of the film.

— Erin Cressida Wilson