That sounds like a plausible solution for the white hair. I tried fixing it in after effect but I can't get it to work without creating side effects that are worse than the hair itself. The only possible way would be to do it frame by frame and I definitely don't volunteer for that ordeal. But painting it out using the DC could work quite well and as far as I'm concerned, it could just stay in those two remaining shots.

As to the anti-aliasing, I vote for unfiltered, it's so minor, that it doesn't seem to be worth softening the picture.