John Malkovich
Actor John Malkovich was originally set to voice the role of Professor Screweyes but dropped out because of disagreements with the animators' vision of the film. Upon the movie's release, Malkovich was a vocal critic of the project, arguing that the scope of the script was not fully realized and that the final product was "sub par, to say the least." To this day, Malkovich generally refuses to talk about the film. In a rare 2003 interview, Malkovich made a brief allusion to the movie, saying, "Good ideas go to die in Hollywood. I worked on an animated movie about dinosaurs in New York once. It was completely bureaucratized. They took something that had art in it and put it in the laps of people that only cared about the bottom line, and look what happened." In a later portion of the interview, Malkovich went on to say, "Yeah, projects like We're Back: A Dinosaur's Story—they just make you sick. That's why I left this town. It's all about the money, the bottom line. It's disgusting."
Exercising my freedom of speech whether you like it or not.