Were they "mistakes"? I'd think that was just part of the nature of optical printing back in the 70s, not necessarily a goof somebody could have avoided (unless I'm wrong on that). I think digitally recompositing the effects to show them in the highest quality is very complimenting of the work that was originally put behind all that, at least for those that were done without any tinkering. That's just how I'd personally feel if I found out that all the work I put it was redone but now without all the generation loss inherent to optical printing. However, I understand the intent in restoring how the effects originally looked back in 1977 to truly recapture how the film was, optical print artifacts and all, all made by the very people that made it possible in the first place. Either way, I think it's all very admirable and I don't mean to knock on anything. I had a great time watching this last night and I look forward to watching the next two later. Good luck with finding ways make further revisions in restoring the look of those three films, Rancor matte lines and all. :)