Jack speaks English and French.
Accents: Cockney, Dublin, Essex, Irish, London, RP, Somerset, South London
General American, New York City
French, German and RP.
Jack plays football, ice hockey and swims.
Jack has 11 GCSE Grades - 7A*, 2A, B - The Highfield School, Letchworth
and 3 A levels -AAB.
Jack can juggle.
Jack is 5' 5" tall (1.65 m).
Jack is the son of casting director Debbie O'Brien and Director Colin Blumenau.
Jack is the brother of actor Harry Blumenau.
Jack is the brother of ice hockey player Dan Blumenau.
Jack was close to getting the role of Harry in Harry Potter, only to be edged out by Daniel Radcliffe, whose mother (Marcia Gresham), was a school classmate of Jack's mother.