The male prostitute's "Whadda ya hear, whadda ya say, Father?" schtick is based on James Cagney's Rocky Sullivan character.
The front page of the Sunday Times that Father LaVelle is reading early in the film has a headline referring to two hitman sought for killings in Dublin, a nod to Ken (played by Brendon Gleeson) and Ray from "In Bruges", a film by John Michael McDonagh's brother Martin.
Mentioned by Danny Leigh when reviewing Cuban Fury (2014)
Footage shown during a montage of upcoming movie releases in Britain