I have a minute to jump in here...
1. I loved this episode. Since I've only caught live episodes since last year and missed last week when it happened, seeing Rhaegal get shot down was my first real shock out of the blue. Sure it wasn't on the same level as the Red Wedding, but I don't care; it was a shock to me.
2. I don't see Arya killing the Mountain. In his weird condition, I think he needs to be killed in close quarters, and she's less set up for close combat than the Viper was. She won't be able to dance around him and wear him down like that, and if she gets close, she would have to be too close for to long to hurt him, which would give him a chance to grab her and squeeze her head like a grape.
3. Was sad to see Tormund go back north of the wall, but it made sense; once a Wildling, always a Wildling.
4. Varys and Tyrion were great in their scenes together. I think they made it clear between them that when things go sideways, even though they have different opinions on what should happen, they still respect each other regardless of what happens. May sound lame, but in the midst of so much squabbling, civilized, respectful discourse is a welcome sight.
5. The writing of the show and the story arcs, dialog, etc, is way beyond anything I could ever do on my best day of writing, but I still feel I need to point out that I want to better feel the justification from Dany wanting to 'break the wheel' to the Iron Throne being her destiny. Would have liked a little more vacillating between the two, but instead she seemed to put her altruism aside without looking back.
6. When did Tyrion and Sansa get divorced? Did her marrying Ramsey Bolton automatically negate it?
7. Missandei saying Dracaris as her last word was fitting but I didn't like it. Too much of a parallel to real life, specifically during the protests in Ferguson, when Michael Brown's stepfather was trying to incite a riot. Tread lightly here; I don't want this thread exiled to the politics forum.
8. If Euron puts 2 and 2 together about Cersei's pregnancy, I don't think he'll care; in fact, I think it gives him leverage over her. And I'm still waiting for a Spanish Armada type naval victory for Yara over Euron's fleet.