Patents are supposed to be on mechanisms, not effects. If you figure out a way to travel through time, your patent only applies to that particular way. Pinch to zoom is something with almost no behind-the-scenes mechanism to it, and what mechanism might be valid for a patent existed in the movie.
But for subject matter to be patentable, the patent must be sufficient to reduce to practice. In the movie it was just special effects, which is not sufficient to meet the reduce to practice threshold.
