Regarding Dorne; surely it's role in the show, irrespective of the writing or portrayal, is to make them an antagonist towards the Lannisters, and thus put pressure on them from the South. And whilst Dorne was the one place not conquered by the Targaryeans, I wonder if they allow for Dany to have an instant ally upon her arrival?
Regarding Red Mel; do we think that scene was more than just a revea of her true nature? Her necklace vades as she takes it off; is she tired, without purpose and frail in belief, as well as body? It's not a case of "well, this is what she actually looks like". It's more than that. If she's been the firey spunky Mel, she'd be praying to the Lord of Light at Jon's side, willing for him to return. Instead, she questions the vision she saw, and retires to her room. Is Davos going to make a deal with the devil he's mistrusted for so long, and persuade her to try something with Jon, or is she spent now? I'm curious as to where she goes as a character, because she promises Arya she'd see her again. I know visions are murky and not what they seem, but it seems odd to make that promise.