-Based on some vampire folklore books I've read, and some books from White Wolf, Vampires can still cast reflections in the mirror, although it will be very faint. Dunno what it looked like in the movie, but their reflections should be almost transparent. Like what they showed in Lost Boys, when the character "Michael" started showing symptoms of being a bloodsucker.
WTF??? That's not s'posed t happen? Maybe the writers forgot that the other half of the cast/characters are supposed to be vampires?
Vampires can sleep a very long time. They usually (again based on Vampire Folklore books I've read) to pass time, or to heal any wounds that was inflicted on them. Contrary to what movies portray, vampires can heal wounds, but how fast, depending on the severity of the wound.
IIRC, silver is supposed to kill or severly hurt vampires, not sure if silver bullets can kill them a'la in the Blade movies.
Lupines are very HORNY creatures. Maybe they wanted something new to pork?
Anywhoo, just to let you guys know, I'm not an authority on vampire and werewolf info, I just say what I read from books.