I really enjoyed the way they handle the wolves, but I think they could have explained in a couple of lines, why the wolves didn't wear much clothing in human form. This would've given some insight to those who hadn't read the book. The reason is that they rip up their clothes when they transform, and their unusually high temp body heat keeps them from needing or wanting clothing on much of the time.
Also, there was a slight mention of Jasper's power. If you didn't already know going into the movie, that would've been confusing. Also, they kind of made Jasper look like an idiot.
The cliff hanger was great, and true to the story.