Robin Williams
Professor Philip Brainard
Marcia Gay Harden
Dr. Sara Jean Reynolds
Christopher McDonald
Wilson Croft
Raymond J. Barry
Chester Hoenicker
Nancy Olson
Secretary at Ford Motor Company
Wil Wheaton
Bennett Hoenicker
Edie McClurg
Martha George
Sam Lloyd
Coach Willy Barker
Scott Martin Gershin
Flubber (voice)
Julie Morrison
Weebette (voice)
Bob Sarlatte
Rutland Coach
Scott Michael Campbell
Dale Jepner
Tom Barlow
Medfield Basketball Player