BTW, this is not a new issue. Crispin Glover sued Zemeckis for using his likeness in Back to the future II. Glover hated the ending of part I so much that he refused to take part in the sequels (well, he also thought he was underpaid). Back then, they used prosthetics on another actor and used old, unused footage from part I, and he successfully sued the producers for 750k... Since then, the SAG includes a clause in their contracts which explicitly forbids this kind of fakery.