Completed by 1968, the film was held up for release by Metro-Goldwyn-Mayer until late 1970 due to internal problems. The animation studio closed soon after the film's release, with MGM leaving the animation business for good. Juster had no input into the adaptation, and has expressed his hatred for the film in an interview: "It was a film I never liked. I don't think they did a good job on it. It's been around for a long time. It was well reviewed, which also made me angry."