Neil Patrick Harris
Arnold Mosk
Matthew Lillard
Doug Van Housen
Gabriel Olds
Gary Trancer
Catherine Hicks
Mrs. Mosk
Stephen Pearlman
Principal Jones
Lori Heuring
Shelly
Amanda Peet
Debbie
Brian Vincent
Eddie LeMaster
Joseph Siravo
Dr. Rankin
Tina Krause
Acid Woman in Black
Frank Vincent
Arcade Owner
Peggy Gormley
Jones' Secretary
Madison Arnold
Older Guard
Stephen Payne
Classroom Guard / Lesson Giver
Elizabeth Kemp
Shelly's Mom
Jeff Hayenga
Shelly's Dad
Michael Torpey
Shelly's Brother
Allen Fitzpatrick
Teacher 4 (uncredited)