I've read the entire series on book and I realize that cramming it into a tv show is pretty impossible, however I'll try to list a few irritations as spoiler-free as possible.

Agree with you on the realizing who Selmy was so quickly. Also....NO STRONG BELWAS? Dany's whole story (starting last season) has always confused me with what the writers are thinking.

The Petyr approaching Sansa bit robs us of the surprise later.

Unless it's coming later, I don't see how they could could omit such a big part of Sam's story against the white walkers.

not sure why they changed up Jon Snow's reason for joining the wildlings.

Didn't mind the Davos change to confront the Red Woman.

That being said, Storm of Swords was my favorite book so they have a lot to cover even in two seasons. It can't help but make the episodes feel like they are jumping all over the place.