Some of the notes Grayson wrote in her script regarding subtext are fascinating, what's behind Carlotta's various smiles and other expressions/actions - and particularly how she saw Carlotta as the other side of Angelique, basically Angelique's physical representation in the world with regard to what is happening to Quentin. She does make these things clear with her performance, but it's still interesting to see everything laid out in Grayson's own words. And it's also interesting how Grayson felt Carlotta should have had a book containing a lock of Angelique's hair and that there would have been some mystery about the book until all would have become clear during the big revelation scene in which Carlotta explains everything to Quentin. But obviously DC didn't go for any of that. Truthfully, I think the locket serves much the same purpose so the book/hair wasn't really necessary.
As for the scene where Grayson felt Carlotta should have been intercut reacting to Quentin and Angelique's lovemaking, well, it might be best that DC never went there because I don't know if the audience was really ready for that.