For laughs I one time combine frames from some really old footage. I upscale the frames so that each pixel becomes a cube of same color pixels. Then I stack them and shift them to line up properly. The resolution goes up and more detail is revealed. Not sure what the limit is of that approach but if there is only one frame that has them you can remove it's grain and correct bends (wobbles? distortions? wrinkles? waves? what is the word?)