- The loss of Angel's soul and the return of Angelus).
- Buffy being stripped of her Slayer powers in preparation for the Cruciamentum.
- Rupert Giles being transmogrified into a Fyarl demon by Ethan Rayne.
- Dawn Summers' discovery that she is the Key and subsequent identity crisis.
- All of the participants of Buffy's birthday party, including anyone else who entered the house, being trapped inside the Summers residence by Dawn Summers' unwitting wish to Halfrek.
Behind the scenes
- Whenever Buffy's birthday was celebrated on-screen, it was always during the twelfth or thirteenth episode of the season.