Part of Seamus's audtion tape was in the teaser trailer for The Omen.
While filming The Omen, no one told Seamus he was playing the devil's son because he was, according to the filmmakers, "too young to understand".
He attends J.M. Hill Elementary School.
He is an only child.
Seamus's nickname is 'Bad Seed'.
He likes to play soccer and make paper airplanes.
His height is 4'4".
Whenever Seamus doesn't want to do chores, he gives his mother the blank, evil stare he uses in The Omen.
Seamus describes himself as "really shy" and "a little afraid of the dark".
While filming The Omen, he spent 8 months in Prague which is in the Czech Republic.
If they made a sequel to The Omen, he would return to play Damien again.
He doesn't like the fact that he will not be able to watch The Omen.
His first on-screen appearance was when he was only a month old.
Seamus is a vegetarian.
His favorite school subjects are gym and recess.
He has sneaker skates and likes to skate.
His name is pronounced "Shay-mus".
He has blue eyes.
Seamus had received an award of the creepiest kid for "The Omen", 2007 Fuse/Fangoria Chainsaw Awards. At the 2007 Young Artist Awards, he was nominated for Best Performance in a Feature Film, age ten or younger for The Omen.
The thing he likes best about being in the movie "The Omen" is that he is the star.
Seamus dyed his hair black for "The Omen."