This is the last appearance of the old Sunnydale High School.
Riley's belief that a normal guy was not enough for Buffy is a sharp contrast to Angel's point of view when he had broken up with her in The Prom (1999), claiming that she deserved someone "normal."
Spike watched Dawson's Creek (1998). Buffy the Vampire Slayer (1997) and Dawson's Creek (1998) both aired on the WB from 1998 to 2001.
When Tara tells Willow that it would be cool to have a real psychic doing readings at the magic box, she is holding a stack of tarot cards. The card displayed to the audience is "The Tower" which stands for a radical shake up of the querent's foundation - usually living situation, romance, or career. Given the outcome of this episode and it's affects on Buffy and Riley's relationship in the long run, it's a fitting omen.
Buffy and Dawn meet Ben Wilkinson.