Season six is the last season in which Hayley (Rachael MacFarlane) is single. While all of MacFarlane's series do show some degree of character development over the years, in living situation, if not personality, it is rare that a main character would get hitched, making their spouse an important part of the show from then on. Hayley spends much of volume six interested in a koala bear named Reginald (Erik Durbin), but her stoner ex, Jeff (Jeff Fischer), does eventually return to win her back, sowing the seeds for their marriage early in season seven.
Interestingly, season six is also when the show went from digital to high definition. This DVD set gives you the ability to compare directly, as the first half of the season is still full frame and low quality, while the second set of nine episodes goes widescreen and enhances clarity. Also, episodes are uncensored, so bleeps and black boxes are removed. Viewers have been warned.
Like most MacFarlane releases, there are tons of extras on the discs. A number of episodes have commentary, though MacFarlane himself does not participate. Luckily, Matt Weitzman, Mike Barker, Matt Fusfeld, Jordan Blum, Wendy Schall, and lots of others are more than knowledgeable enough to take his place. Two commentaries feature The Interdisciplinary Collective for American Dad Studies, which rather than spoil what that is, I'll let you find the treat on your own. Most episodes have deleted scenes, even if they are brief.
"Rapture's Delight" gets special treatment, with a "Making Of" special and the broadcast script. This is a favorite episode of the staff, as well as viewers, and not just because religious people may consider it blasphemous. Rounding out the extras is a tribute short honoring all of the various animals that have met their end on the series. It's darkly hilarious, so if you're not easily offended, check it out.
American Dad Volume 6 is already in stores, so please go pick up a copy at your earlier convenience.