I get the tywin thing, i think it would be pretty hard to accept that Arya just 'forgot' about him when naming who to kill like what happened in the book. This ways a little more believable for the show imo.

But i have no fucking clue what is going on with Dany. I think its pretty clear that the Wizard dude took the dragons, and the theft will be the reason Dany goes to the house of the undying...but i dont see why they had to do it this way.