They conceived numerous plot ideas, with Groening's being the one developed into a film. The script was re-written over a hundred times, and this creativity continued after animation had begun in 2006. This meant hours of finished material was cut, which included cameo roles from Erin Brockovich, Minnie Driver, Isla Fisher, Kelsey Grammer, and Edward Norton. Tom Hanks and Green Day appeared in the final cut as themselves.