I do agree with you Harmy about the flaws, what I liked most about negative 1's release was the grain levels changing during every scene with optical effects in it. I was reading this forum page (it's very fascinating), and paid particular attention to this comment by Jim Wicks:

I have color restored over 200 classic motion pictures to date, and picked up quite a number of observations.
Typically, I have noticed that the opticals change at a much different rate than the body of the film.
The opticals are the opening title sequence, fades, cross dissolves, and closing credits.
It's as though I am working on two completely different films: the opticals and the body of the film present different challenges.