 For inspiration for the crowd scenes in the film , the production staff referenced a poster featuring more than 320 Simpsons characters . Groening said they tried to include every single character in the film , with 98 having speaking parts , and most members of the crowds being previously established characters instead of generic people . The series ' regular voice actors : Dan Castellaneta , Julie Kavner , Nancy Cartwright , Yeardley Smith , Hank Azaria , and Harry Shearer , as well as semi @-@ regular performers Tress MacNeille , Pamela Hayden , Marcia Wallace , Maggie Roswell , Russi Taylor , and Karl Wiedergott , reprised their roles . Joe Mantegna returned as Fat Tony , while Albert Brooks , who supplied many guest voices in episodes , was hired as Russ Cargill , after he told the staff that he wanted to be part of the film . For " about a week " , he was to reprise the role of Hank Scorpio from the episode " You Only Move Twice " , but the staff felt that creating a new character was a better idea . 
