1) Grab a set of laserdiscs (or DVDs)
2) Watch it and make notes about what you think is wrong with any given scene
3) Put your suggestions up on the various forums for discussion.
Perhaps there should be a general 'requested fixes' forum created that anyone can post suggestions in for everyone to look at. Most people are working from the same or similar sources, so if you watch one of those and see something you don't like then post it around for people to discuss.
Then one of the multitude of people doing a restoration may or may not decide to use your suggestion in their project.