Cursed is another example. The original was way different and had different actors in it. But they went through so many re-writes and reshoots and s***. Once the final had the final script done they could not get alot of the original actors back so alot had to be replaced or their characters just written out. They had already finished the first version of the film. By the time it was done, they ended up shooting the whole movie all over again. Scream 2 had that problem with the ending because the original ending of the film leaked online way before the film was out. So they had to shoot a whole new ending. Scream 3 I heard had a few endings written out. Even one with Sidney Campbell dies. Not sure if they filmed it or not though.