"If he gets nothing else right, Chris Weitz had better not screw up ... the emotion that is so tangible during the cliff-diving scene."
Contrary to beliefs that we want Rob in every scene, it is not true. How can we feel the same emotions as Bella if we are still seeing Edward every 15 minutes? It will make the reunion all the sweeter in the end if we are missing Edward just as much as Bella.
Try to stay true to the original color palette. It was simply stunning and it will help tie the movies together. We want to feel like it is the same series after all.
Pay a little more attention to hair and make up. Even small details. Trust me, fans notice everything, good or bad. With a bigger budget comes bigger expectations.
The biggest advice I can give is: Keep Stephenie Meyer involved every step of the way! If Steph has the say that she did in Twilight, New Moon can't go wrong. Trust and listen to her as Catherine did.