The was originally conceived of as a self-contained episode called "Hell".
The street Buffy walks down after being resurrected is the same street used in 'desperate housewives' most notably the house Buffy stops at to lean on the car where the man comes out of and shoots his shotgun in the air, is the same house where Susan Meyer lives. Also notable is the house where Mike Delfino lives in, this can be seen when Dawn and Spike watch from across the street where the biker gang loot.