In this project, "bad frames" are frames with stuff that appear suddenly and distracts from the film itself, things that shouldn't be there. We decided that we will only fix the most visible ones, since fixing all of them would require long, hard work that we're just not willing to do. It's difficult enough to fix all the ones we've already found.
Examples from SW:
So don't expect the movies to be free of bad frames, but expect to see less of them than in the raw GOUT. :)