I genuinely laughed out loud at the Season 2 throwback with King Stannis, the One True King of Westeros and Grammar. "Fewer." "What?" "Nothing."
Seriously, the scene between Sam/Gilly/Stannis was 'how much plot relevant info-dump can we get in one scene?' It's nice to see what plot points will be relevant in the books.
1. Sam, the Citadel and Oldtown.
2. Possibly seeing Randyll Tarly, mentioning his military prowess.
3. The Dragonglass off Dragonstone. I was wondering about this the other day, it's nice to see that it is plot relevant. In the books Stannis had sent word for his men to Minecraft it at this point, TV Stannis clearly has not. (Another reason why I think Stannis will be okay for a bit - if he dies by the end of the season, how do they get enough Dragonglass to the North to fight the White Walkers?) Special mention of Stannis' ships, too, he'll need them back.
4. Stannis starting to get an understanding of the White Walkers.
The greyscale plot must end up being relevant to the King's Landing etc, if Jorah's taken Connington's plotline.
I'm absolutely baffled about Mel/Shireen/Selyse leaving with Stannis, curious to see how it plays out with Jon. For The Watch has to happen in some form, because they're telegraphing it too much. (No, Edd, no! Not you, too!)
I don't think we'll be getting the Battle of Winterfell this season, because Ep. 8 is Hardhome and Ep. 9, with a title of 'The Dance of Dragons' has to be Daznak's Pit. Not a ton of budget for much of a battle. Stannis does have some kind of skirmish (House Baratheon video with Stannis with a bloodied face), though, but I'm not sure if it's with the Greyjoys or the Boltons.