Trivia: Whilst filming his death scene on the beach, Ron Perlman shattered his kneecap when a wave hit him.
Trivia: Nathan and Karen were spotted traveling on the "Fourth Street Bridge." The odds of being on a bridge when fleeing the city of Pittsburgh (movie's primary setting) are quite high - there are 446 bridges in Pittsburgh, the greatest number of any other city in the world. [Venice, Italy previously held the record with 443 bridges.] Perhaps not surprisingly, Pittsburgh is nicknamed "The City of Bridges."
Trivia: Despite relatively high billing in the opening credits, Stana Katic only has about five minutes of screen time.