Robin Williams
Lance Clayton
Alexie Gilmore
Claire Reed
Daryl Sabara
Kyle Clayton
Evan Martin
Andrew Troutman
Geoff Pierson
Principal Wyatt Anderson
Henry Simmons
Mike Lane
Mitzi McCall
Bonnie McBon
Jermaine Williams
Jason
Lorraine Nicholson
Heather Johnson
Morgan Murphy
Morgan
Toby Huss
Bert Green
Tom Kenny
Jerry Klein
Jill Talley
Make-Up Woman
Bruce Hornsby
Himself
Krist Novoselic
Newspaper Vendor
Bobcat Goldthwait
Limo Driver (uncredited)
Tony V.
Dr. Pentola
Naomi Glick
Ginger
Dan Spencer
Dan Spencer
Zachary Vitale
Peter (as Zach Sanchez)
Ellie Jameson
Jennifer
Michael Thomas Moore
Chris
Ray Buckley
Metal Kid
Rebecca Erwin Spencer
Nosy Neighbor
Cheri Minns
Nosy Neighbor
Zazu
Nosy Neighbor
Mable Mae
Mabel
Deborah Horne
Dr. Dana
Riley Dean Stone
Bruce Hornsby's Mic Stand
Ray Buckley
Metal Kid
Zoe
The Fighting Pug