I think Dany's repeated clashes with
winesellers might be a hint that Dany will clash with House Redwyne in Westeros. In AGOT, a wineseller tried to poison her (and was dragged naked behind her horse until he died). In ADWD, several Unsullied were poisoned at a wineshop, and Dany allowed the Shavepate to torture the wineseller and his daughters. House Redwyne, of course, is heavily associated with
wine, and since we know Dany and winesellers don't mix, perhaps Dany's repeated clashes with winesellers foreshadow House Redwyne screwing Dany over in Westeros.
During the original Dance of the Dragons, two members of the Kingsguard, the twin brothers Ser Arryk and Ser Erryk, fought on opposite sides and ended up killing each other. Paxter Redwyne has twin sons, Ser Horas and Ser Hobber: in AFFC, Taena makes a comment about how "both of them want to join the Kingsguard, just to be near the little queen.” I wonder if Ser Horas and Ser Hobber will end up as this generation's Ser Arryk and Ser Erryk.
In ASOS, Jon remembers Benjen telling him some bits of information about the Watch's history:
Quote
... did you know that six hundred years ago, the commanders at Snowgate and the Nightfort went to war against each other? And when the Lord Commander tried to stop them, they joined forces to murder him? The Stark in Winterfell had to take a hand ... and both their heads.
I wonder if this old story parallels the political situation at the Wall vis a vis Eastwatch and the Shadow Tower. The commanders of those two castles have certainly been metaphorically "at war" for a long time. And it's entirely possible that the commanders of those castles have now joined forces to murder their lord commander: at the time of Jon's stabbing, the commander of Eastwatch was Ser Alliser's BFF, someone with an interest in harming Jon. Ser Denys Mallister remained the commander of the Shadow Tower, but there are reasons to wonder if perhaps Ser Denys might have joined the conspirators' plot: he's a snob (so he and Selyse would get on famously, but not so much he and the wildlings), he has very strict notions about how things should be done at the Wall (the whole story of Mance's mended cloak tells us this), and though we never hear his opinion of Jon's reforms in ADWD, it would be in keeping with what we know of him for him to vehemently oppose Jon's pro-wildling plans. Let us not forget how an eagle almost ripped out Jon's eye in ASOS, and the eagle is the sigil of House Mallister.
In a more general sense, the story of the clash between
Snowgate and the
Nightfort that was ended by the Stark of Winterfell could foreshadow the conflict Jon Snow has with the traditions of the Night's Watch. It could presage a clash between Selyse and Jon (Snowgate is a castle which obviously evokes the name of the current Lord Commander and was renamed because a queen visited it, and the Nightfort is the original seat of the Lord Commander that "Queen" Selyse now claims to rule in place of the Lord Commander); a clash between Melisandre and Morna White Mask (Morna now holds Snowgate/Queensgate and Melisandre could logically flee to Stannis's new seat at the Nightfort, and hey, both women are witches); or even between the Others (snow) and the Watch (the night).