 | Jason Segel als Will Harbor |
 | Rooney Mara als Isla |
 | Robert Redford als Dr. Thomas Harbor |
 | Jesse Plemons als Toby Harbor |
 | Riley Keough als Lacey |
 | Ron Canada als Cooper |
 | Brian McCarthy als Andy |
 | Kimleigh Smith als Pam |
 | M.J. Karmi als Janice Phillips |
 | Adam Khaykin als Oliver |
 | Mary Steenburgen als Interviewer |
 | Connor Ratliff als Coroner |
 | Willie C. Carpenter als Hospital Janitor |
 | Wendy Makkena als Mom |
 | Lindsay Schnebly als Newscaster |
 | Richard O'Rourke als Marvin (uncredited) |
 | Paul Bellefeuille als Pat Phillips (uncredited) |
| Charlie McDowell | Director |
| Charlie McDowell | Writer |
| Justin Lader | Writer |
| Alex Orlovsky | Producer |
| James D. Stern | Producer |
| Nicole Daniels | Casting |
| Courtney Bright | Casting |
| Saunder Jurriaans | Original Music Composer |
| Danny Bensi | Original Music Composer |
| Jennifer Lilly | Editor |
| Sturla Brandth Grøvlen | Director of Photography |
| Keri Langerman | Costume Design |
| Akin McKenzie | Production Design |
| Erika Hampson | Co-Producer |
| Anne Mulhall | Casting |
| Danica Chipman | Set Decoration |
| Jason Mayoh | Art Department Coordinator |
| David Rotondo | Construction Coordinator |
| Hilary Taillie | Property Master |
| Justin Bliss | Assistant Property Master |
| Zairi Malcolm | Script Supervisor |
| Doug Bernheim | Music Supervisor |
| Sheila Grover | Costume Supervisor |
| Margaret Palmer | Key Set Costumer |
| Gianna Soprano | Set Costumer |
| Sarah Hill Richmond | Tailor |
| Susanne Scheel | Casting |
| Dann Fink | ADR Voice Casting |
| Bill Trautvetter | Second Unit Director of Photography |
| Seacia Pavao | Still Photographer |
| Jesse Goldberg | Gaffer |
| Jennifer Evans | Dolly Grip |
| Nolan Ball | First Assistant Camera |
| Woody Bell | Key Grip |
| David C. Romano | Key Grip |
| John Ruggieri | Special Effects Coordinator |
| Lynzi Grant | Visual Effects Producer |
| Lauren Orban | Visual Effects Producer |
| Kelly Doran | Boom Operator |
| Mark Filip | Foley Editor |
| Jason Fyrberg | Sound Mixer |
| Brenda McNally | Hair Department Head |
| Shayna Passaretti | Key Hair Stylist |
| Trish Seeney | Makeup Department Head |
| Isabel Cafaro-Anderson | Digital Intermediate |
| Alex Bickel | Digital Intermediate |
| Arthur Hiou | Stand In |
