Growing up in post-World War II era Arizona, young Sammy Fabelman aspires to become a filmmaker as he reaches adolescence, but soon discovers a shattering family secret and explores how the power of films can help him see the truth.
| Mitzi Fabelman | Michelle Williams |
| Burt Fabelman | Paul Dano |
| Benny Loewy | Seth Rogen |
| Sammy Fabelman | Gabriel LaBelle |
| Younger Sammy Fabelman | Mateo Zoryan Francis-DeFord |
| Natalie Fabelman | Keeley Karsten |
| Young Natalie Fabelman | Alina Brace |
| Reggie Fabelman | Julia Butters |
| Younger Reggie Fabelman | Birdie Borria |
| Uncle Boris | Judd Hirsch |
| Lisa Fabelman | Sophia Kopera |
| Hadassah Fabelman | Jeannie Berlin |
| Tina Schildkraut | Robin Bartlett |
| Logan Hall | Sam Rechner |
| Chad Thomas | Oakes Fegley |
| Monica Sherwood | Chloe East |
| Claudia Denning | Isabelle Kusman |
| Renee | Chandler Lovelle |
| Sal | Gustavo Escobar |
| Hark | Nicolas Cantu |
| Turkey | Cooper Dodson |
| Roger | Gabriel Bateman |
| Angelo | Stephen Matthew Smith |
| Grand View High School Principal | James Urbaniak |
| Grand View High School PE Coach | Alex Quijano |
| Barry | Kalama Epstein |
| Phil Newhart | Connor Trinneer |
| Dean | Lane Factor |
| Bernie Fein | Greg Grunberg |
| John Ford | David Lynch |
| Nona | Jan Hoag |
| Camera Store Clerk | Carlos Javier Castillo |
| Camera Store Clerk #2 | Ezra Buzzington |
| Pinnacle Peak Owner | Paul Chepikian |
| Janet Benedict | Brinly Marum |
| Stunt Soldier Boy | Mason Bumba |
| Singer #1 | Mary M. Flynn |
| Singer #2 | Adriel Porter |
| Singer #3 | Tia Nalls |
| Scout Father | Larkin Campbell |
| Natalie Photo Double | Harper Dustin |
| Bennie the Monkey | Crystal the Monkey |
| Taxi Driver (uncredited) | Art Bonilla |
| Student (uncredited) | Meredith VanCuyk |
| Senior Classmate (uncredited) | Vera Myers |
| Boy Scout (uncredited) | Cody Mitchell Key |
| Senior Classmate (uncredited) | Caroline Anna-Kaye Green |
| Chad's Posse (uncredited) | Rob Shiells |
| Theater Goer (uncredited) | Julyah Rose |
| Chad's Posse (uncredited) | Jonathan Moorwood |
| Theatre Patron (uncredited) | Ari Davis |
| Lead Guitarist (uncredited) | Jared Becker |
| Balloon Girl (uncredited) | Kendal Evans |
| High School Friend (uncredited) | Trang Vo |
| Boy Scout (uncredited) | Alejandro Fuenzalida |
| Boy Scout (uncredited) | Orion Hunter |
| Boy Scout Sibling (uncredited) | Samantha Rose Gomez |
| Senior Classmate (uncredited) | Taylor Stone |
| Senior Classmate (uncredited) | Sarah Hamilton |
| Cheerleader (uncredited) | Paige Locke |
| Senior Classmate (uncredited) | Marissa McBride |
| Student (uncredited) | Malachi Mickelonis |
| Student (uncredited) | Max David Weinberg |
| Student (uncredited) | Cameron Hennings |
| Sammy’s Classmate (uncredited) | Nicole Alicia Xavier |
| Boy Scout (uncredited) | Nikolai Bazan |
| Prom Date (uncredited) | Nicco Caruso |
| Boy Scout (uncredited) | Colt Carville |
| Theater Patron (uncredited) | Ure Egbuho |
| Classmate (uncredited) | April Elize |
| Student (uncredited) | Seth Fuentes |
| Pedestrian/Theater Patron (uncredited) | Andrew Goodman |
| Student (uncredited) | Phoebe Grant |
| High School Student (uncredited) | Cat Heinen |
| Volleyball Player (uncredited) | Jake Kidwell |
| Boy Scout in Theater (uncredited) | Julian Lerma |
| Chad's Teammate (uncredited) | Cody Miller |
| Teacher (uncredited) | Nick W. Nicholson |
| Driver (uncredited) | Molly Renze |
| Cheerleader (uncredited) | Paige Robberstad |
| Senior Class Member (uncredited) | Brandon Keith Rogers |
| Sammy's Classmate (uncredited) | Lucy Schmidt |
| Student (uncredited) | Nicole Singh |
