We learn:
- She really does think that Stannis is the chosen one, is Azor Ahai reborn, will bring about an endless summer and so on. It's not all just a trick by her on Stannis. If the real Azor Ahai picks up his magic sword and it glows hot, then we she will be as surprised as everyone else.
- She is trying to get Jon on her side, and using predictions to help with that. But she knows less than she would like to make the predictions impressive enough. So there are limits to what she can predict
- In the fire she sees real images, but they are open to interpretation, and she is not always certain about the correct interpretation because it is an art not a science.
- There is an enemy beyond the wall. There is also a wooden man with a boy with a wolf's face, probably Bran and the three-eyed crow, who is working with Melisandre's enemy.
- Melisandre sees a battle involving flaming arrows and wights beneath a cliff. After talking to Jon about it she decides it must be Eastwatch on the Sea. But I am certain she is wrong about that. She's running with it and making what look like confirmation-bias errors about how even if Eastwatch looks different, visions are often wrong in these details.
- She know Jon Snow is a warg because he appears as both wolf and man in her visions.
- She used to be a slave girl called Melony from Lot 7.
- When she prays to see Azor Ahai, she sees Jon Snow instead. Could that be a subtle hint? Is he the real one
- She's not actually a horrible person. She keeps one of Davos's sons around her so he doesn't get killed in battle because she doesn't want Davos to suffer any more grief.
- She does not fear death because R'hllor will protect her, and also she could see if she was going to die in her visions of the future.
- She thinks she has the weight of the world on her shoulders.
- She does not need to eat and only needs to sleep a little. She does not like dreaming because she thinks dreams come from the other, bad god.
- She has hidden pockets to do fire tricks with, but she doesn't need them so much near the wall because it is easier to do real sorcery.
- Melisandre gets hot enough to melt nearby ice.
Three rangers heads turn up on spikes outside the gates, almost exactly as predicted by Melisandre.
The big reveal is that the Lord of Bones is in fact Mance Rayder with a magical disguise (a glamor, just like the one Arya's friend had). The real lord of bones was the one who was burned. That might explain the shrieking, wailing and begging that seemed rather unbecoming of Mance, at the time. Apparently the trick was expensive for Melisandre and made her ruby really hot. Jon is pretty surprised by all this. But at least someone is going looking for Arya. But is it fake Arya? Or Sansa? Or real Arya? Or someone else?