It would've been nice if they had shown us how the face-swap trick is done instead of scene after scene of her stick-fighting.

Would've been nice if we had seen Jacquen actually show her something.

But it's moot at this point. I thought the writing in this episode was much, much better than most of the rest of the season. With one exception: Cersei becoming queen. That's not how things work in Westeros, but I'll let it slide.