A small thing I was thinking about that kinda lines up with HuskiesAllDay's post about the HH zombies and the ones from episode 6:
Outside of adding to the drama, why were the zombies/wights trying to free the captured zombie? They're dead, they don't care about each other. It's not like Jon & company could have grabbed a really popular or important zombie. It could be that the Night King had directed his army to also free the captive, but why would he care? He hasn't been trying to conceal his forces or his purpose. If the NK was directing his forces, why didn't he command 60 or 80 zombies to encircle the enemy and attack at the same time, instead of one at a time, black ninja-style?
On the Sansa-Arya interaction, in one of the season previews, there was a voice over by Sansa saying something along the lines of the lone wolf perishes while the pack survives. Was that from an earlier season, because I don't think Sansa has said anything like that this season? It could be nothing, it could be foreshadowing Sansa turning on Arya or it could mean the Stark sisters will put aside their differences and deal with the person who's been trying to drive a wedge between them.