Alexz Johnson originally auditioned for the role of Julie and arrived at the audition in a punk-rock outfit claiming to be in a 'bad mood'. The casting directors immediately wanted her as 'Erin'; the goth girl with a bad attitude and offered her that role instead.
The DVD included a 'Choose Your Own Adventure' feature, allowing you to choose things differently. In execution, this led to seeing different takes or versions of death scenes instead of actual changes to the story.