If these little spats between Sansa and Arya were all in public, I could buy that it's a ploy. But not in a private bedroom where nobody else would witness. They really don't trust each other. But it'll probably be worked by next episode, hopefully with LF dead, so don't really care too much.
So the new theory for why the Night King has been hanging north of the Wall all this time is that he was setting a trap... for dragons he somehow knew about, based on a dumbass quest to catch a wight he somehow knew would happen. Mmmkay. If the Night King is really clairvoyant that's gonna pose some obvious plot problems....
Oh and Tyrian is advising Dany to walk into King's Landing instead of finding neutral ground?! That's very stupid. I'm wondering if maybe he really does intend to betray her. But I don't see how he would do that if it would help Cersei.