Shit, it's quite a few years since I played it but I distinctly remember the crackling audio in the intro movie so I'm assuming that's normal.
As regards the non-loading, hopefully that won't happen again as, with the game being mint, it suggests the disc could be faulty or your DC is showing the early signs of having some sort of problem.
Btw, I think AITD is a really good game. The graphics are beautifully rendered with gorgeous detail and fantastic lighting. It's all very atmospheric and pretty creepy with some bits scaring the living shit out of me !! lol. Turn the lights down and turn up the volume for maximum effect
I did find some of the puzzles a touch obscure and fairly difficult so had to consult my Prima Guide a few times to finish it. That could be because I'm a bit dumb though !! lol