- His father was Irish, from Kerry. His mother is of English background.
- 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.
- Considered for the role of Gary Unwin in Kingsman: The Secret Service (2014).
- 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.
- Friends with George Clooney.
- Was in a relationship with Kaya Scodelario, while starring in Skins (2007), until 2009.
- He used to work as a farmhand in between acting work.
- 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.
- Is a big fan of Derby County Football Club.
- He was considered for the role of Bruce Wayne/Batman in The Batman (2021).
- Trained at the Central Television Workshop in Nottingham, along with Vicky McClure, Joe Dempsie and Michael Socha.
- Is good friends with Joe Dempsie.
- He left school at the age of sixteen.
- Was in a relationship with Tulisa from March-June 2012.
- 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.
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