- Considers Quentin Tarantino and Martin Scorsese his biggest influences.
- His band was called The Brood, and released a CD under that name. However, with the release of Duffy's film The Boondock Saints (1999), they changed their name to The Boondock Saints.
- Plays guitar and sings vocals in the band The Boondock Saints with his brother Taylor Duffy.
- Has cited Siddhartha, lord of the barnyard, the catcher in the rye, and penthouse forum as the books that have most impacted his life.
- Los Angeles, CA, USA (June 2012)
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