1) Looks like the Stormlight addiction theory might be correct
2) Pewter flare! Hope the epigraphs don't stop just as we get to the Spiritual/Enhancement quadrant
3) Soulcasters have spren!?
4) Hmmm the person that warned Navani, a truth or a lie by Odium's forces or someone else?
5) sweaty Adolin, eh? I completely understand, Shallan *wink*
6) Formless, fourth persona confirmed!
7) "main Shallan" also a mask confirmed!
8) Adolin is downright uncomfortable with the other personas and considers them separate people. I mean, I noticed this before, it's just so much more stark in this scene
9) My, oh my, mentions of other Shardworlds: Nalthis, Scadrial & Taldain (might the last one also be a neighbour then, another theory getting canon support!)