Crispin Glover sued the Back to the Future producers in 1985 because they recast him with a different actor in a prosthetic mask. The SAG rule that came out of it is now the only thing stopping studios from CGI-ing actors without consent.
I interviewed him in 2006 for a small SF arts publication. He was surprisingly candid about all of it — the lawsuit, what the studios were already thinking about actor likeness even then, why he made *What Is It?*
The conversation reads completely differently now that we have the tools to actually do what he was worried about.