I've seen the movie twice now.
First I must say that I loved the movie! I thought Kristen was amazing as Vampire Bella. I loved the humor. Loved the "twist". Here are a few things I wish they had done differently.
When Charlie meets Bella, I wish they would have had her notice his neck/pulse, something to make it more obvious how difficult this was for her.
On the sparkle front I wish they had done a shot after the arm wrestling like the book so that all the Cullens are sparkling. They should have been sparkling at the end in the meadow too, they were in full sun!
Sex/romance scenes...should have been longer and they should have put more of them in there to show how they couldn't keep their hands off each other. Even just more making out would have been nice. They could have shown them in the bath tub!
Meadow scene at end - Edward should have been more shocked and surprised when Bella took down her shield and showed him her thoughts.
That's it for now :) I'd love to hear your thoughts...