Director John Lee Hancock explains why actress Emma Thompson was the perfect choice to play Mary Poppins author P.L. Travers in the first of two new featurettes for the upcoming holiday drama Saving Mr. Banks. Stars Tom Hanks, Colin Farrell, B.J. Novak and more take us behind-the-scenes for a look at Mary Poppins' arduous journey from the pages of a popular children's book to the silver screen.