 Jake GyllenhaalJeff Bauman | Jeff Bauman |
 Tatiana MaslanyErin Hurley | Erin Hurley |
 Miranda RichardsonPatty Bauman | Patty Bauman |
 Richard Lane Jr.Sully | Sully |
 Nate RichmanBig D | Big D |
 Lenny ClarkeUncle Bob | Uncle Bob |
| PPatty O'NeilAunt Jenn | Aunt Jenn |
 Clancy BrownJeff Bauman Sr | Jeff Bauman Sr |
 Kate FitzgeraldAunt Karen | Aunt Karen |
 Danny McCarthyKevin Horst | Kevin Horst |
 Frankie ShawGail Hurley | Gail Hurley |
 Carlos SanzCarlos Arredondo | Carlos Arredondo |
| MMichelle ForziatiJill Hurley | Jill Hurley |
| SSean McGuirkBill Hurley | Bill Hurley |
| KKaren ScaliaLori Hurley | Lori Hurley |
| JJudith McIntyreMichele Kerr | Michele Kerr |
| DDr. Jeffrey KalishDr. Jeffrey Kalish | Dr. Jeffrey Kalish |
| JJohnny HickeySecurity Guard | Security Guard |
| CCassandra Cato-LouisMaya | Maya |
 Rena MaliszewskiAgent Morrell | Agent Morrell |
 Jaime FitzSimonsFederal Agent | Federal Agent |
| DDiana BoudreauBruins PR Rep | Bruins PR Rep |
 Tony ViveirosHusband at Bar | Husband at Bar |
| PPatricia RossWife at Bar | Wife at Bar |
| VVinh DoanChinese Restaurant Bartender | Chinese Restaurant Bartender |
| JJeremiah KisselFirst Responder at Marathon | First Responder at Marathon |
 Owen BurkeTownie #1 | Townie #1 |
 Mike O'DeaTownie #2 | Townie #2 |
| NNick CairisTownie #3 | Townie #3 |
| DDafna GottesmanRed Sox PR Rep | Red Sox PR Rep |
