The DVD has a special feature about the making of the film, which is fascinating. Author Marjane Satrapi talks about how she wanted the animated version to be based on the graphic novels, but really be its own animal. Knowing nothing about animation, she had the smarts to team with filmmaker and comic artist Vincent Paronnaud to realize this vision.
In this special feature, you also get to see the animators at work. And it's animated the old-fashioned way - hand drawn!