^ Yeah, I hate it when they dub stuff. I was watching one of my favorite movies the other day and noticed that it had been dubbed. It distracted me from the whole scene. Fortunately, I have yet to notice any glaring gaffes in Buffy (minus the horrible snake effects and Spike's reflection). A boom dip does seem mighty unprofessional, though.
I never understood why vamps could be seen by cameras but not by mirrors. Honestly, I also never understood why they could be seen by human eyes but not in mirrors. I think that in the days before cameras and TV shows, it had something to do with the fact that vampires weren't really there in the corporeal sense. They borrowed reanimated corpses, yes, but they also borrowed other forms, like fog and wolves. They were shapeshifters, devoid of any permanent, true form. Also, they were soulless. There was nothing but bloodlust animating a desecrated, stolen form. Due to that impermanence and the lack of anything real emanating from within the borrowed body, the lack of a reflection makes a weak resemblance of sense in a weird metaphysical kind of way. They reflected nothing because there was at core nothing to reflect. Whedonverse vampires, of course, just sort of borrow the neat trick of having no reflection and use it all Willy Nilly like without any real consistency - hence the showing up in photos but not in mirrors thing. It's really annoying.