The main demo feature and intros featurette are 720p, but it's important to note they're 60p. 720@60p is the only 60 frame-per-second progressive format Blu-ray supports, so that's why we went with it (because demos at 30fps or lower don't have the same impact). At that size and framerate, 720@60 uses 88% of the bandwidth of 1080@30. I explain all this to illustrate that we didn't go with 720@60 for size reasons -- it was intentional, to match the full quality of the source material.

All the other special features (NVScene talks, production notes, etc.) are 1080@24 or 1080@30i.

We didn't consider a multi-disc release since we were already doing a Blu-ray+DVD combo pack. Trying to do a second disc of both would have increased the cost 50%, and we really wanted to keep it at the $20 mark, because who wants to spend more than that on a Blu-ray?