Which “Early Installment Weirdness” of ASOIAF is more in contradiction with how the series has evolved and so an interesting glimpse of what might have been?

Great question!

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.