- Has played a Nazi foil for Harrison Ford twice, in L'ouragan vient de Navarone (1978) and Indiana Jones et la Dernière Croisade (1989). In both movies, his character ends up in a vehicle falling off a cliff.
- Has played a Nazi in Indiana Jones et la Dernière Croisade (1989) and a Jewish survivor of the Holocaust in Un élève doué (1998).
- He was brought up by a single mother from Kilkenny Ireland.
- He and his Harry Potter et les Reliques de la Mort : partie 1 (2010) co-star Bill Nighy both played General Friedrich Olbricht in dramas depicting the 20 July Plot to assassinate Adolf Hitler: Byrne in Complot contre Hitler (1990) and Nighy in Walkyrie (2008).
- Considered for the roles of Roger Derebridge, Dr. Bukovsky. Lamson, Kelly and Dr. Armstrong in Lifeforce - L'étoile du mal (1985).
- Father of Allie Byrne, but - despite a popular misconception - is no relation to Gabriel Byrne.
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