The behind the scenes disputes between Community star Chevy Chase and show creator Dan Harmon were well publicized. Harmon was vocal about Chase being difficult to work with, while Chevy retaliated with an enraged, curse-laden voicemail which was, of course, leaked to the media.
Chase later walked off the set, causing havoc with filming. Harmon left the show after season 3. Chase left after season 4 and Harmon came back for season 5. NBC dropped the show after season 5 but a sixth, and seemingly final season was produced by Yahoo Screen.