Many minor characters in the film are played by themselves, including most of the medical professionals, who re-enacted the real events in unscripted scenes. Dr. Jeffrey Kalish removes the bandages from Jake Gyllenhaal's legs just as he had from Jeff Bauman's, and five members of the Martino family play themselves at United Prosthetics. Others include the rehab techs and nurses at Spalding Rehab, and first responder Jerry Kissel.
Bruins fans Scott and Aaron Tisdale were extras in the scenes filmed when Jeff Bauman receives the honor of being wheeled out to wave the Bruins flag at the "Bruins vs Blackhawks game. Those scenes were actually reenacted on 4/5/2016 after the Boston Bruins vs Carolina Hurricanes game.
Aunt Jen, played by Patricia O'Neil, and Young Husband played by Patrick Languzzi, were high school classmates. Their friendship dates back to first grade where they both starred in the play, The Cross Princess, at MacArthur elementary school, in Waltham, Massachusetts.