Note that extras tied to specific episodes are reviewed with those episodes.
DVD ROM Willow Demon Guide may or may not be interesting. All I know is that I tried and failed to access this using two different computers.
Buffy: It's Always Been about the Fans focuses on Buffy fandom. It is much shorter than what would be expected from the only extra on the disc and says little more than the fact that the show has a devoted fan base. It contains interviews with Joss Whedon, Jane Espenson, James Marsters, and various fans. There are spoilers through the final scene of the final episode of the show.
Featurette: Season 7 Overview - Buffy: Full Circle discusses various themes of the seventh season, mostly focusing on the characters. It contains interviews with Joss Whedon, Douglas Petrie, Marti Noxon, Jane Espenson, Rebecca Rand Kirshner, David Fury, Drew Goddard, Alyson Hannigan, James Marsters, David Solomon, Drew Z. Greenberg, Michelle Trachtenberg, Tom Lenk, Anthony Stewart Head, and D.B. Woodside.
Featurette: Buffy 101: Studying the Slayer contains interviews with various critics and scholars who have championed the show over the years. Interviewees include Matt Roush (TV Guide), Vivian Sobchack (UCLA School of Theater, Film, & Television), and Robert Bianco (USA Today). Most of the featurette talks about how great the show is, something that any viewer who has made it this far has already figured out. As a result, it probably would have been a better extra on an earlier DVD set. On this set, it just comes across like a thank you to the critics who supported the show.
Featurette: Generation S focuses on the annoying brats (a.k.a. potential slayers). It suffered from general cluelessness. For example, the potentials were described as all being separate characters even though I needed to take notes to tell them apart when I first watched the seventh season. Most importantly, it seemed not to understand that the potentials were incredibly annoying and unlikable. It contains interviews with Felicia Day, Jane Espenson, Joss Whedon, David Solomon, Iyari Limon, Indigo, and Sarah Hagan.
Featurette: The Last Sundown
involved Joss Whedon discussing his memories of the show over clips of his ten favorite episodes. His list is very astue as each of the top eight episodes according to the Webmaster is in Whedon's top nine. Whedon's remaining two episodes are in the Webmaster's top twenty. Whedon's top episodes are:
10. "Prophecy Girl"
9. "Conversations with Dead People"
8. "Restless"
7. "Becoming, Pt. II"
6. "The Wish"
5. "Doppelgangland"
4. "The Body"
3. "Hush"
2. "Once More, with Feeling"
1. "Innocence"
Outtakes Reel includes bloopers and general goofing off from the seventh season. It mostly focuses on Emma Caulfied, but Nicholas Brendon and Tom Lenk are also seen regularly. Alyson Hannigan, Michelle Trachtenberg, Anthony Stewart Head, James Marsters, Danny Strong, Adam Busch, Marti Noxon, and Joss Whedon also have small appearances. Once again, it appears that Sarah Michelle Gellar is never involved in any bloopers.
Buffy Wraps covers the final wrap party for the show. It mostly contains comments about how people liked being on the show. It contains interviews with Marti Noxon, Joss Whedon, Alyson Hannigan, James Marsters, Anthony Stewart Head, Alexis Denisof, Michelle Trachtenberg, Julie Benz, Juliet Landau, Nicholas Brendon, and Emma Caulfield.