I hear the idea that reshoots aren't a big deal...and I think SOMETIMES that is true...but also, just a few minutes of film, even WITHOUT big special affects can great affect how it is perceived. The last few minutes of The Last Samurai, where Tom Cruise is shown to have survived, basically ruins the film. Had he been the Last Samurai for a couple of minutes (before dying), it would have been a cool movie. But by that short scene, it becomes a perceived trope of Cruise being the super-hero of the movie, and loses my interest in it.