When Tommy meets his Chef for the first time in kitchen the Chef has an imprint of a right hand in blood on his tunic. 'Red Right Hand' is the theme music for the show.
The passport page Luca used to get in UK shows entry to Cambodia using Bavet's immigration stamp which only exist from at least 2008.
Scenes were filmed in the Northern Quarter, Manchester at the end of April. Crowds surrounded the scenes hoping to catch a glimpse of Cillian Murphy or Tom Hardy, who were rumored to be on set. Murphy briefly emerged in the distance, however Hardy was not seen.
Filming started in Liverpool, Monday the 20th of March.
Charlie Murphy (Jessie Eden) & Sophie Rundle (Ada Shelby) also worked together on Happy Valley (2014) as Ann Gallagher & Kirsten McAskill respectively.