 Bill Murray was also considered for the role, but due to his idiosyncratic method of receiving offers for roles, Murray missed out on it.Eddie Murphy reportedly turned down the role as he misunderstood the concept of cartoon characters and human beings co-existing; he later regretted this decision.Several other actors were also considered for it, including Robin Williams, Robert Redford, Jack Nicholson, Sylvester Stallone, Wallace Shawn, Ed Harris, Charles Grodin, and Don Lane.