Catherine Hardwicke had originally cast Kirsten Stewart in the role of Valerie, and unknown actor Robert Pattinson in the role of Peter but realised what an incredibly mind numbingly stupid idea that would be. It was then decided to cast a load of people we'd never heard of other than that guy from Harry Potter. And he's in Batman too. Oh and that Dracula film with Keanu Reeves with the worst English accent known to man.