Professor Philip Brainard
Dr. Sara Jean Reynolds
Wilson Croft
Wesson
Smith
Chester Hoenicker (as Raymond Barry)
Bennett Hoenicker
Martha George
Weebo (voice)
Sylvia
Father
Window Boy
Minister
Teenage Boy
Coach Willy Barker (as Samuel Lloyd)
Dale Jepner
Rutland Coach
Referee
Medfield Basketball Player
Flubber (voice)
Weebette (voice)
Basketball Fan (scenes deleted)
Basketball Fan
Basketball Attendee (as J.D. Walker)
Basketball Fan (uncredited)
Basketball Ball Game Attendee (uncredited)
(uncredited)
Student / Basketball Fan (uncredited)
Wedding Guest (uncredited)
Neighbor (uncredited)
Basketball Announcer (voice) (uncredited)
Fan with Broken Leg (uncredited)
Medfield Alumnus (uncredited)
Basketball Player #3 (uncredited)
Student (uncredited)
Ford Secretary (uncredited)
Vendor (uncredited)
Basketball Player (uncredited)
Mr. Sylvan (uncredited)