Scotty, of course it's real. I have way too much to do to make up reviews for movies.
So as for Kidder, she has two scenes, one having the funniest line in the entire movie. Nothing too special of a role but again, it is what it is.
Harley doesn't die nude, no. She gets hers before she gets the chance to get naked. Ask away if there's anything else you want to know! :)
Scotty - To answer your question - Annie goes to the bathroom to get some pills. She opens the medicine cabinet and you know he's going to be there when she closes it which she is. She backs away slowly before starting to scream. He grabs her and it cuts back to the party, I believe for a minute before cutting back to the house where we just hear banging and screaming. The next time we see her is when the girls find her bloody on the floor.
As for the others, there wasn't much action in the film. It followed the pretty standard pace of a Halloween movie. The first hospital scene was the most suspenseful and none of the rest of the film lived up to that scene.