Within the special features is an interesting interview. It is led by Mike Uslan with Dennis O’Neil, Dan Didio, and Scott Snyder commenting on various aspects of Batman as well as DC comics itself at times.
Fun fact: before Frank Miller apparently went bat-shit insane and became more famous for things like this or this, he was THE iconic Batman writer. Famous for saving the character from the annals of bad camp, Miller’s Batman: The Dark Knight Returns was a ground-breaking piece in 1986, and he followed it up only a year later with an in-continuity Batman tale that was, if not groundbreaking, at least trend-setting. Batman: Year One was originally published in four issues of Batman in 1987, and it’s been republished in multiple collections ever since, a definitive origin story for DC’s most popular hero.