Before being cast as John Wilkes Booth in Sleepy Hollow he auditioned for the role of Souvenir Seller, which went to Daryn Kahn. 6 days later he was asked to read for Booth. He received his offer 2 days later.
One of Adrian's biggest influences as a villain, Peter Stormare, played the devil in the film Constantine. Adrian would later go on to play the devil in a movie with Stormare in which Stormare's character's name was Constantine.
He was the shortest kid in his class through elementary school.