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Danny DeVito was also considering the Veronica Guerin story as a directing project. He met with her family when he was in Dublin doing promotional work for Matilda (1996) and hoped to cast Winona Ryder in the role.
The dance scene where Veronica dances with her family to "Everlasting Love" was added in on the spot by Cate Blanchett.
While watching a football match together, Veronica tells the Tattooed Boy that once she met Eric Cantona. Cate Blanchett and Cantona worked together in Elizabeth (1998).
Composer Harry Gregson-Williams heard a boy (Brian O'Donnell) singing on the street for money in Dublin when he arrived to spend a few days on the set of the film. Later, he tracked the boy down again and recorded him singing six or seven folk songs acapella in a quiet alley. Gregson-Williams chose "Fields of Athenry" from the recording and added his own music around the song.
A daily Irish newspaper recently reported that Portlaoise prison (where John Gilligan and Brian Meehan are incarcerated) screens the movie at least once a month in the prison common hall at the request of the prisoners.