Colin Hanks as Shaun Brumder

Jack Black as Lance Brumder

Schuyler Fisk as Ashley

Catherine O'Hara as Cindy Beugler

John Lithgow as Bud Brumder

Mike White as Mr. Burke

Lily Tomlin as Charlotte Cobb

Chevy Chase as Principal Harbert

George Murdock as Bob Beugler

Carly Pope as Tanya

Natasha Melnick as Katie

Kyle Howard as Arlo

Bret Harrison as Lonny

R.J. Knoll as Chad

Lillian Hurst as Lupe

Leslie Mann as Krista

Garry Marshall as Arthur Gantner

Dana Ivey as Vera Gantner

Harold Ramis as Don Durkett

David Doty as Public Safety

Monica Keena as Gretchen

Jane Adams as Mona

Nat Faxon as Kip

Olivia Rosewood as Dana

Lizzy Caplan as Party Girl

Kevin Kline as Marcus Skinner (uncredited)

Ben Stiller as Firefighter (uncredited)

Alexandra Breckenridge as Anna

Tom Kenny as SpongeBob SquarePants / Gary (voice) (archive footage)

Fran Kranz as Shane Brainard

Carolina Lancaster as Dancer