A few less-obvious thoughts:
I really quite enjoyed the attention to detail, mostly the humour and wit that was put into the script throughout, from the beginning with Tyrion's joke about balls to towards the end with the joke about the blue eyes, but also the cleverness of timing and amount of easter eggs reminding us of past seasons. It showed how much effort they have put into making this final season exceptional.
With Sam's conversation with Dany and then his subsequent revelation to Jon and the way he pitted it against her, I'm interested to see how/if the subplot of Sam against Dany develops.
Another thing that caught my attention was Arya and Gendry's reunion; I may have been overanalysing, but it seemed a tad flirty, so wouldn't be surprised if they made some deal of giving Arya a romance subplot, seeing as she's at that kind of age where it would be normal. Then again, the trailer shows her, as per usual, battling it out, and the moment where she seems childishly spellbound, I don't think there's otherwise indication of in any way a change of character.