- Considered for the role of Gary Unwin in Kingsman: The Secret Service (2014).
- Was in a relationship with Kaya Scodelario, while starring in Skins (2007), until 2009.
- He had a very troubled upbringing. As a youth, he was in and out of court on charges related to alcohol and violence, and he received a one-year young offender's referral order when he was 17.
- He had planned to join the Army, believing it to be the only way he could make an honest living, but his juvenile criminal record prevented him from enlisting.
- His father was Irish, from Kerry. His mother is of English background.
- Friends with George Clooney.
- Grew up wanting to be a footballer. Had trials with Derby County as a schoolboy.
- His maternal grandfather, Kenneth Harold "Ken" Gutteridge, was a professional footballer and manager.
- He used to work as a farmhand in between acting work.
- Is a big fan of Derby County Football Club.
- He was considered for the role of Bruce Wayne/Batman in The Batman (2021).
- He left school at the age of sixteen.
- Trained at the Central Television Workshop in Nottingham, along with Vicky McClure, Joe Dempsie and Michael Socha.
- Was in a relationship with Tulisa from March-June 2012.
- Is good friends with Joe Dempsie.
- He had aspired to be a football player in his youth and had trials with Derby County but a series of injuries ended his career.
- Despite portraying Italian-American WWII Veteran Louis Zamperini in the film Unbroken, Jack himself is not of Italian descent. He dyed his natural brown hair black to appear more Italian for the role.
Contribute to this page
Suggest an edit or add missing content