The weird additions you point out are bizarre and makes me wonder if there were any more that you just missed, because little changes tend to get by unless someone is really familiar with the film. Heck, sometimes they even get by then.
I'm actually re-watching the disc now (working up a review of the film for either this week or next) and have noticed a number of added sound effects - something I hadn't noticed when first working up the disc for review.
There's irony in mucking up one of the few remaining english language 35mm prints (there's an Italian print floating around that's in better shape than what Retromedia used for their release - it's been floating around on DVDs there for a few years now) of the film with new video and sound effects. . . sad sad irony.