Nolan talked about "influence of technology" such as making films meant to be watched over and over on DVD, how people who "didn't want all the answers to Inception enjoyed it more" and how he tries to give audiences a bang for their buck by layering his films with as much information as possible.
http://www.moveablefest.com/moveable_fe ... owing.html
http://www.moveablefest.com/moveable_fe ... owing.html