I never got to see NoDS at all during its theatrical release because we were out of town in a trip (to Florida, I think) the week that it played in our local theatre. I guess it must have been sometime in August.
People who weren't around in the '70s have no idea what it was like trying to catch a movie back then. Movies didn't open all across the country on the same day and in thousands of theaters, like they do today - they opened regionally over a period of months. If you lived around a major city, you usually didn't have to wait too long for something to get around to your area - but other parts of the country could wait months to see something that the rest of the country had seen long before. And no matter where you lived, you had no idea when anything was going to open until you either saw the trailer in a local theater or you saw an ad in the newspaper (most Sunday editions would print big ads for that week's upcoming openings). And even then, more often than not, movies only played for a week, so if you didn't have the chance to go to see them that week, you may have never again gotten the opportunity to see them in a theater. I was lucky with NoDS because my local theater didn't open the film until three weeks after the initial New England opening, so I was able to see NoDS several more times after I'd seen it at the RI drive-in.
Was any of the wild scene where Charles and Angelique are making love in the swimming pool which had been turned into a torchlit, phantasmagoric realm of hell by the production crew for the occasion, still in the print you saw?
As far as what I've read, DC never included the dream sequence in any version of the film, which is a pity because from pictures and snippets in the trailers it looks like it would have been quite interesting. But getting back to some of the things that are included in the Amazon/iTunes version, have you ever watched it? If not, you might want to because there's a point where you get to hear the beginning of one of Carlotta's lines that isn't in the current version of NoDS and also wasn't in the version that I'd seen back in '71:
Near the end of the scene in which Carlotta shows Quentin and Tracy the Gallery, after Quentin has had his vision of Angelique's body hanging in the tree, Tracy has questioned him as to what's wrong, and he replies that he guesses he was just daydreaming, as the camera holds on Quentin's close up, we hear Carlotta return to the room (recall that she had left to get a salad that she had prepared) and she says, "I brought some..." before her line gets cut off by the transition to the bedroom scene later that night.
It'll be interesting to see if the entire continuation of the Gallery scene is in the restored version when it comes out on DVD/Blu-ray or if that snippet of Carlotta's line solely exists in the Amazon/iTunes version. I believe it will be restored because it's listed in the DS Movie Book as one of the currently missing sequences that did appear in the original 131 minute print. So, for Graysonholics, that bit in the Amazon/iTunes version is like getting a brief preview of one of the things to come.