What Did P.L. Travers Really Think of Disney’s ‘Mary Poppins’? (Part 1) D55 Staff July 29, 2013 D23, Walt Disney Studios With Disney's Mary Poppins celebrating it's 50th anniversary next year, the film is definitely getting plenty of attention recently. In December 2013, Walt Disney Pictures will release Saving Mr. Banks, which is the story of the original Mary Poppins novelist, P.L. Travers, and the difficulties faced by Walt Disney himself in obtaining the motion picture rights from Travers.