This film was originally directed by Bob Peterson and set for release on May 30, 2014. However, Peterson had trouble getting the third act right, so he was taken off the film and Pixar pushed it back to November 25, 2015, the intended release date of Finding Dory (2016), in order to give it more time. In effect, the latter film was pushed back to June 17, 2016. Peterson has since gone on to do a different film for Pixar, while John Walker was replaced by Denise Ream as producer for "The Good Dinosaur". Peter Sohn was officially named director on October 21, 2014. His contribution to the film was scrapping the idea of dinosaurs being farmers and adding the concept of nature itself being the main antagonist.