posted 13 years ago
Movies, and all works of fiction, are allowed to create their own internal logic, which might be very different from the real world. Readers or viewers have to accept these differences to enjoy the work. That's what's meant by willing suspension of disbelief, and covers things like talking animals, flying cars, and superheroes. However, if the work doesn't stay consistent to its own internal logic, many readers and viewers justifiably feel betrayed. So, to take a famous example from my youth, Superman flying is fine, but when Superman flies so fast that he causes the world to turn backwards (when he earlier had trouble catching up to a missile), and that somehow causes time to go backwards, and he doesn't even bother to re-save all people that would have become un-saved, then we have a problem.