 | Tom McGowan als Pat |
 | Aaron Schwartz als Gerry |
 | Shaun Weiss als Josh |
 | Tom Hodges als Lars |
 | Leah Lail als Julie |
 | Paul Feig als Tim |
 | Kenan Thompson als Roy |
 | David Bowe als Chris Donelly |
 | Max Goldblatt als Phillip |
| Robert Zalkind als Simms |
 | Patrick LaBrecque als Dawson |
 | Jeffrey Tambor als Maury Garner |
 | Jerry Stiller als Harvey Bushkin |
 | Anne Meara als Alice Bushkin |
 | Ben Stiller als Tony Perkis / Tony Perkis Sr. |
| David Goldman als Nicholas |
| Joseph Wayne Miller als Sam |
| Cody Burger als Cody |
 | Allen Covert als Kenny |
 | Tim Blake Nelson als Camp Hope Salesman |
| Nancy Ringham als Mrs. Garner |
| Seth St. Laurent als Camp MVP Racer |
| Bobby Fain als Camp MVP Pitcher |
| Robert E. Spencer III als Soccer Goalie |
| Dustin Greer als Blob Master |
| Matthew R. Zboyovski als Hope Wall Climber |
| J.T. Alessi als Balloon Shaver |
| Chris Snyder als Baseball Scorekeeper |
 | Aubrey Dollar als Camp Magnolia Girl |
| Mary Holt Fickes als Camp Magnolia Girl |
| Jamie Olson als Camp Magnolia Girl |
| Lauren Hill als Angelic Girl |
| Landry M. Constantino als Kissing Girl |
| Lois Yaroshefsky als Camp Magnolia Counselor |
| Matthew Bradley King als Gerry's School Buddy |
 | Deena Dill als Stewardess |
| Tom Kelley als Man on Plane |
| Lars Clark als Jack Garner |
 | Judd Apatow als Homer |
| Steven Brill | Director |
| Kimberly A. Tillman | Costume Design |
| Chris L. Spellman | Set Decoration |
| Harry Darrow | Art Direction |
| Jack Ballance | Art Direction |
| Stephen Storer | Production Design |
| Judy Taylor | Casting |
| Lynda Gordon | Casting |
| Carroll Timothy O'Meara | Editor |
| Charles J.D. Schlissel | Co-Producer |
| Joe Roth | Producer |
| Jack Giarraputo | Associate Producer |
| Michael Fottrell | Co-Producer |
| Sarah Bowman | Executive Producer |
| Judd Apatow | Executive Producer |
| Roger Birnbaum | Producer |
| April H. Grantham | Craft Service |
| John Rice Sr. | Transportation Co-Captain |
| John Lybrand | Picture Car Coordinator |
| Jerry Jackson | Transportation Coordinator |
| Richard A. Davis | Transportation Captain |
| Mark A. Dixon | Location Manager |
| George Bosley | Location Manager |
| Kwame L. Abernathy | Location Assistant |
| Candisse Reynolds | Assistant Location Manager |
| Richard Schoen | Costumer |
| Deborah Latham | Costume Supervisor |
| Allyson B. Fanger | Costumer |
| Steve Boyum | Stunt Coordinator |
| Kip Bartlett | Leadman |
| David B. Householter | First Assistant Director |
| Steven Brill | Writer |
| Judd Apatow | Writer |
| Victor Hammer | Director of Photography |
| Keith Campbell | Stunt Double |
| Christian J. Fletcher | Stunts |
| Doc D. Charbonneau | Stunts |
| Jack Carpenter | Stunts |
| Kent W. Luttrell | Stunts |
| Gary Guercio | Stunts |
| Gregg Smrz | Stunts |
| Michael Fottrell | Unit Production Manager |
| Charles J.D. Schlissel | Unit Production Manager |
| Richard Oswald | Second Assistant Director |
| Katherine E. Beyda | Production Supervisor |
| Steve Boyum | Second Unit Director |
| Paul Varrieur | "A" Camera Operator |
| Jerry Holway | "B" Camera Operator |
| Mark Van Loon | "B" Camera Operator |
| Jerry Holway | Steadicam Operator |
| Mark Van Loon | Steadicam Operator |
| Michael A. FauntLeRoy Sr. | First Assistant Camera |
| John Verardi | First Assistant Camera |
| Thomas Greco | Second Assistant Camera |
| Ken Hudson | Second Assistant Camera |
| Mary H. Ellis | Sound Mixer |
| Bill Fibben | Boom Operator |
| Rebecca Poulos | Script Supervisor |
| Shirley Fulton Crumley | Location Casting |
| Merrilee Dale | Second Second Assistant Director |
| Layne Brightwell | Costumer |
| John R. Bayless | Key Makeup Artist |
| Carolynn Weast | Makeup Artist |
| Geordie Sheffer | Key Hair Stylist |
| Judith H. Bickerton | Hairstylist |
| Michael Burnett | Prosthetic Makeup Artist |
| Katie Willard Troebs | Production Coordinator |
| Christine Fransen | Assistant Production Coordinator |
| Richard E. Rabjohn | Additional Editing |
| Robert L. Sinise | Additional Editing |
| Sam Citron | First Assistant Editor |
| Karen Rasch | First Assistant Editor |
| Gordon Antell | Assistant Editor |
| David Koeppel | Assistant Editor |
| Schuyler Kent | Casting Assistant |
| Richard J. Cartwright | Still Photographer |
| Bill Purcel | Special Effects Coordinator |
| William Purcell | Special Effects |
| Scott Rushton | Special Effects |
| Donna Cline | Storyboard Artist |
| Patrick Dodd | Sound Supervisor |
| Rick Ash | Sound Re-Recording Mixer |
| Dean A. Zupancic | Sound Re-Recording Mixer |
| Andy D'Addario | Sound Re-Recording Mixer |
| Francesca Dodd | Dialogue Editor |
| Mark Levinson | ADR Editor |
| Erik R. Kraber | Assistant Dialogue Editor |
| John Verbeck | Foley Editor |
| Eric Thompson | Foley Mixer |
| Michael Semanick | Foley Recordist |
| Linda Lew | Foley Recordist |
| Michael T. Ryan | Supervising Music Editor |
| Laura Ziffren | Music Consultant |
| Theresa Repola Mohammed | Negative Cutter |
| Gloria Kaiser | Color Timer |
| Alan Hopkins | Second Unit First Assistant Director |
| Michael Ferris | Second Unit Director of Photography |
| J.A.C. Redford | Original Music Composer |
| Nick Nelson | Electrician |
