Over at the AV Club, Noel Murray is watching Buffy the Vampire Slayer for the first time and posting his thoughts about each episode as he goes along. As I was reading his review of "Bewitched, Bothered & Bewildered," I came across this:
My very first thought when I read that? "I read a Harry Potter fanfic like that once."
My theory about Cordelia not being affected by the love spell: In the actual episode, some arcane explanation for her invulnerability is offered, but I think the answer is much more simple. I think she wasn’t affected because she was already crazy in love with Xander. It’s like in Trivial Pursuit, when you have to answer a pie-piece question even though you already have that color pie-piece. Cordelia already has her Xander pie-piece.