The first 18 discs in this 19-disc set contain no new material. The transfers appear just as solid as those that appeared on the three season box sets, and I didn't notice any significant difference in the audio department. The same featurettes and audio commentaries are all included, and are discussed in more depth in the three individual season reviews on this very website. The packaging is very attractive and sturdy, with glossy cardboard sleeves featuring full-color photos of the cast containing the discs. The box is approximately the same size as one of the single seasons, so it really saves on shelf space, too. Ah, but what about that 19th disc? What treasures does it hold? Honestly, I kind of wish that I could tell you that the disc was full of lame EPK-style featurettes, and that you didn't need to worry about missing out on it. However, um…that's really not the case. In fact, if you're a serious Deadwood fan, the content on this disc is nearly must-see material. If you don't want to actually upgrade to the complete series box set, at least rent it from your local movie borrowing facility.

So what exactly is on this disc that makes it so special? The most notable supplement is a 22-minute featurette called "The Meaning of Endings: David Milch on the Conclusion of Deadwood." It begins as an explanation of where a fourth season would have gone. Milch gives us a nice taste of what would have been going on with Swearengen, Bullock, Alma, and other characters. However, the featurette quickly takes a left turn and becomes something far more fascinating and poetic. Milch seems dejected, and shuffles through the empty Deadwood set as he begins to reveal his deep sadness and frustration with the show. I found it to be one of the most revealing and moving behind-the-scenes featurettes I've seen, and there's a genuine honesty that is rarely permitted in this sort of thing. Nothing else is that good, but there are some more worthwhile special features. We get an hour-long conversation with the cast and crew from 2005 (it's best to watch it just after episode 2.3, which was screened before the chat), and there's a 30-minute featurette on the real, historical Deadwood. A 7-minute "Deadwood 360 Tour" is a brief look at the set. Finally, we conclude with the immensely entertaining "Al Swearengen Audition Reel," in which cast member Titus Welliver gives us a look at what it might have been like if Al Pacino, Christopher Walken, Robert Duvall, and Robert De Niro had tried out for the role. Move over, Rich Little. Welliver nails every one of these guys, and he also does a spot-on David Milch. A very funny concluding note that will undoubtedly lift the spirits of bitter Deadwood fans.