While this was all most certainly thrown out of whack after the events of the series finale, I want to know what was up with the Slayer lineage between seasons 2 and 7.
Only one girl is called to be a Slayer at a time, after the previous one dies. After Buffy's brief death in the season 1 finale, Kendra was called. After Kendra's death in the season 2 finale, Faith was called. At that point, you had two active Slayers (Buffy and Faith). When Buffy died for a longer period of time in the season 5 finale, no other Slayer was called. I assumed this was because Buffy's first death removed the lineage from her and passed it on to Kendra who passed it on to Faith. I thought the whole Slayer thing only ever thought Slayers would die once, so Buffy ("Hey, I died twiiiiice") threw a kink in the system.
But all throughout season 7, Buffy kept saying to the Potentials that if she dies any one of them could be called to be a Slayer, seemingly forgetting that no one was called when she died in the season 5 finale. Was she just messing with the Potentials? Did the writers make a goof? Who did the Slayer lineage run through, really?