I wouldn't read to much into the Hitchcock influence on this movie. The movie is full of the regular psychological tricks like police that can't see the tree's through the forest, the attacker almost teleporting around conveniently. That kind of stuff that us horror movie buffs have seen a thousand times before.
There was a couple of things that I didn't like at the end. The first one was that the mysterious key wasn't ever explained, I kind of knew this was going to happen. It was just there to help us connect the dots which was probably necessary as I wasn't too sure if the attacker was male or female for most of the movie but the key itself could have been used more creatively to bind it to the story I thought rather than just forgetting about it in the last leg.
But the most annoying thing was that the explanation was so pointlessly convoluted leaving us without a care in the world with what they were even saying. It was the worst ending of its kind because I actually liked a lot of the rest of the movie. Being a first movie for these guys they clearly fell into the trap of over thinking it rather than just giving the viewer something they could more easily grasp.
