I can think of a number of ways that scene could be improved:
- I’m doubtful about the whole revelation of the White Walkers as creations of the Children of the Forest; that really doesn’t fit with anything GRRM has written.
- The mark of the Night’s King I don’t think will happen the same way, since the Night’s King isn’t as much a present-day thing for GRRM. I also imagine that GRRM will be a bit more deft with Bran’s learning from Bloodraven, which wasn’t handled well on the show.
- I think Leaf, Bloodraven, and Summer will acquit themseles better than they did in the show.
- I think the “blocking” will be done better, so that it’s much clearer that Hodor’s sacrifice is A. necessary, and B. accomplishes something. On the show, Meera and Bran are still requiring immediate rescue on the other side of that, which makes his actions less impactful.