Painting out these movie mistakes as part of a restoration is wrong. What's in the movie is in the movie, and altering the movie to this extent is a form of revisionist history.
No, screw you.
I hate this piece with a passion. The cataloguing of "revealing mistakes" effectively ruins that scene forever for everybody. That's way more annoying than cleaning up an obvious mistake in a subsequent revision. I hate movie nerd trivia for this reason.
It's not just dumb staging goofs, either. Who can watch the "kicking the helmet" scene in Two Towers or the hand cut in Django these days without being immediately skyrocketed out of the movie and into movie trivia land? That, if nothing else, is why I don't like leaving real world injuries in movies. No matter how well the actor rolls with it some nerd with a passion for DVD extras or IMDB triva pages is going to make a listicle for other nerds to quote at each other and ruin the scene for all eternity.
So hey, if the goof is the kind you can clean up with a computer to shut the dorks up forever, by all means, erase that crap away. Hell, even ones where there isn't technically a mistake are a bummer. I know exactly where Robert Downey Jr.'s fake torso starts in that cute flirting scene where he gets his battery pack changed by Gwyneth Paltrow and I really hope they end up giving him a CG body in a remaster some day because I don't want to be staring at the uncanny valley forever when I get to that part.