Continuity mistake: When the Witch of Walls emerges from the Wall Without End, the camera cuts to a close up and pans up her body, if you can call it that. Her hands change shape and her fingers are different in the close up than when she is first seen emerging from the wall. The ends of her sleeves also change from pink to a darker pink, almost purple. And several of the stone pieces making up her chest change shape slightly and some change color.
Picture added by Quantom X