One thing that bothers me is how quickly Daenerys drops everything and flies north.
Why the fuck didn't she just go to begin with? What could have possibly been written with that raven that changes mind from "fuck you all" to "I'm on my way" in such a hurry?
Also how doing that in the first place would have just seen the undead horde walking around and there would have been zero need for the LOTR quest that Jon and his Ka-Tet... I mean Fellowship had to go do.