Annie Rose Buckley , Ruth Wilson , B. J. Novak , Rachel Griffiths and Kathy Baker star in Saving Mr. Banks .
Centered on the development of the 1964 film Mary Poppins , the film stars Emma Thompson as author P. L. Travers and Tom Hanks as filmmaker Walt Disney , with supporting performances by Paul Giamatti , Jason Schwartzman , Bradley Whitford , and Colin Farrell .