It's no secret that NIGHT OF DARK SHADOWS fell victim to studio meddling. Yes, the script was often meandering and included enough endings to make Peter Jackson blush, but MGM's "solution" just aggravated the problem(s). The cut that was eventually released to theaters in the summer of 1971 sometimes didn't make sense, thanks to hasty edits made for no other reason than to shorten its running time.
CURSE OF DARK SHADOWS. Some pages in the presskit were revised to reflect the name change while others weren't.
(Note: I'm not sure when it was decided to change the film's title. It was referred to as CURSE in the press as early as May that year, and the film was released in August.)
Worse, there are sections of the press materials devoted to scenes that didn't appear in the final cut. It's not unusual for trailers to include unused footage, but it's bizarre that MGM would court this sort of elaborate confusion. It's not unusual for studios to fall out of love with a project (rumor has it HOUSE OF DARK SHADOWS saved MGM from bankruptcy the year before) but the presskit for NoDS reads like homework that was completed at the last minute. Which it almost certainly wasn't, because of the references to scenes that were cut shortly before its release.
Carlotta's death was included in the final cut; the séance was not. It was an important enough moment in the film for MGM to single out for attention in its marketing. Included in the 32-page presskit was not only a photo from the scene, but a section devoted to spiritualist Hans Holzer's "supervision" of the séance. Holzer would go on to greater acclaim by championing the bullshit "Indian Burial Ground" explanation for the so-called "Amityville Horror." Which is interesting to me, because I've got a theory that NIGHT OF DARK SHADOWS was a direct inspiration for that hoax. They're essentially the same story.
The website Shadows on the Wall has a great gallery of press materials from NIGHT OF DARK SHADOWS.