Hey, It's That Guy!: If you're watching the Baryshnikov/Kirkland film, one of American Ballet Theatre's most famous ballerinas, Sallie Wilson, has a walk-on as an old lady during the party scene.
Urban Legend of Zelda / Demonization: There is a bit of copypasta floating around the Internet claiming, among other things, that in E. T. A. Hoffmann's original story Marie that lived in a loveless household, that she was depicted lying in a pool of her own blood after injuring herself, and that her parents punished her for it by locking her in her room until she admitted she'd been naughty. None of this is true.
Well, the part about the pool of blood is true. (Marie breaks the glass in the front of her doll cabinet and slices her arm open, and her mother finds her lying there surrounded by her dolls and passed out from loss of blood.) But she's confined to her room not because she was being punished, but because she was recovering from the injury.