And those ones had a three year gap between releases. I guess that's not too far off of the two year gap between the new trilogy films. I'm clueless on how much directors actually do and the work involved on a movie as a whole, but why is it that some decide to film two movies back to back? The first one that always comes to mind for that is Back to the Future 2 and 3, and I'm pretty sure they're doing it with the Avengers right now. For Star Wars, would it mostly be a concern about spoilers leaking out, especially since they plan on a two year gap between release dates?