Steve Martin (Gil Buckman)
Mary Steenburgen (Karen Buckman)
Dianne Wiest (Helen)
Jason Robards, Jr. (Frank Buckman)
Rick Moranis (Nathan)
Erika Rafuls (Amy)
Lamont Lofton (Fotomat Clerk)
Zachary Lavoy (Justin)
Julie Lander (Student in Hallway)
Richard Kuhlman (Young Frank)
Jordan Kessler (Matt)
Paul Keeley (Kevin, Age 21)
Claudio Jacobells (College Student)
Greg Gerard (Dr. Lucas)
Dana Mark (Audrey)
Michael Mickens (Dwarf)
Jane Jenkins
Steve Zurk (Highway Policeman)
Walter Von (Opposing Coach)
Cindi Vicino (Teacher)
Charmin Talbert (Nurse at Hospital)
Maxie Pontius (Safety Man at Track)
W. Bruce O'Donoghue (Umpire)
Janet Moore (Irate Woman in Audience)
Emil Felski (Doctor at Hospital)
Billy Cohen (Eddie)
Lloyd Cleek (Miles)
Sherry Ferguson (Screaming Co-ed)
Clint Howard (Lou)
Rance Howard (Dean at College)
Janet Hirshenson
Louisa Marie (Teacher)
Hillary Matthews (College Student)
Alisan Porter (Taylor)
Ivyann Schwan (Patty)
Isabelle Cooley (Barbara Rice)
Jonathan Bouck (Dwarf)
Aspen Autrey (Dwarf)
Connie Adams (Cindy)
Alex Burrall (Cool)
Todd Hallowell (Track Official)
Lowell Ganz (Stan)
Max Elliott Slade (Young Gil)
Leaf Phoenix (Garry)
Helen Shaw (Grandma)
Dennis Dugan (David Brodsky)
Eileen Ryan (Marilyn)
Jasen Fisher (Kevin)
Paul Linke (George Bowman)
Tom Hulce (Larry Buckman)
Martha Plimpton (Julie)
Keanu Reeves (Tod)
Harley Jane Kozak (Susan)