A clip from DS even appears in the Buffy Season 2 DVD bonus features.
I really need to start watching my Buffy DVDs one day - most are still sitting on the shelf with their plastic still on them. But I don't want to start watching them until I have the time to watch the series all the way through. (And, no, Midnite, I haven't seen those last six episodes from Season 7 yet. But like I say, for me Buffy still hasn't ended until I watch them.
)
In addition to that, one of the writers mentioned DS in a commentary, saying that he "felt Buffy was closer to My So-Called Life than Dark Shadows."
Exactly.
there are a few paragraphs dedicated to DS in Buffy: The Monster Book, though they had a few pieces of incorrect information if I remember correctly.
Imagine that. Though hardly surprising given that incorrect info about DS is pretty much and quite sadly the norm in most books.