One of the things that the Ur-Text really helped with is giving us critical context for understanding where the early installment weirdness was coming from:
- The whole business with Jaime becoming Warden of the East was probably setup for Jaime the King.
- The direwolves hating Tyrion was clearly foreshadowing for him burning Winterfell.
- Finally there’s the stuff with Sansa and Arya’s original intended fates.
There’s a few more things listed here.