Last night, while looking for something else, I did find my copy of "Dark Shadows II" with Grayson's notes. Really quite fascinating. MB is correct--the words about intercutting the scene of Quentin and Angelique briefly making out together with a shot of Carlotta's face in some sort of sexually excited state are in Grayson's handwriting. Regardless of what Sam says now, I do wonder whether including this element more explicitly may have been discussed at the time. On the other hand, I bear in mind Grayson's remarks in a number of interviews, most memorably in the 1982 "Grayson Gathering" tape, about how much more interesting it is for an actress to decide she "has a secret" about a character and to play certain scenes with "the subtext" of that secret in mind. (In one of the interviews printed in TWODS after her death, GH gives a whole little discourse on the meaning and significance of "subtext" for an actor. A fan who became a friend of hers reports somewhere that GH would in some cases write out pages and pages of notes for "subtext" in a given role. I've often wondered what her notes for Julia's subtext--over the years in the TV show--would have spoken about.)
So, my thought at this point is that by and large, a lot of Grayson's notes about Carlotta's role as the physical link that made it possible for Angelique to act as she did in the world of 1971 were probably her own ideas--her "secret" for the character.
One note that surprised me is that in the scene where Carlotta arrives to find that Quentin has just cut her nephew's face open, Grayson describes Carlotta's reaction as having an element of "animal excitement." I think that Sam and Dan (and Lela, if she was around) must have vetoed Grayson playing the scene that way...
G.