After battling the Mayor, Wesley headed off to become a rogue demon hunter which led him to L.A. There he met Angel and Cordelia and joined their private investigation work (in the spin-off show Angel). He became steadily cooler, stubblier and hoarser over the years was unrecognisable from the stuffy …

Cordelia stakes a vampire for the first time in Graduation Day (Part 2).

In Graduation Day (Part 2), Larry and Principal Snyder are killed by the Mayor. Harmony is bitten by a vampire. She returns in season four as a fabulous vampire. I’m not sure how she was turned as when she was bitten there was a massive amount of confusion, so the …

The father-daughter relationship between Giles and Buffy was mirrored by that of the Mayor and Faith. This is never more evident than his distress over Faith’s coma in Graduation Day (Part 2), when he tried to suffocate the one who hurt her - Buffy. The Mayor made a tape sometime …

After Graduation Day (Part 2), David Boreanaz quietly left Buffy for his own show Angel, which aired in the autumn of 1999. He returned to Sunnydale a few times, in the Buffy episodes Pangs, The Yoko Factor, Forever, End of Days and Chosen.

Cordelia Chase’s final episode in Buffy the Vampire Slayer was Graduation Day (Part 2). She then moved to L.A on a mission to become an actress but instead met with Angel, making her life take an unexpected turn in the spin-off show, Angel. Cordelia never returned to Sunnydale.

Angel is able to enter the Professor’s home uninvited in Graduation Day (Part 1), because the vampire invitation rule no longer applies when the owner of a home is dead.

Amy the rat makes another appearance in Graduation Day (Part 1). She witneses Willow and Oz making love.

In Graduation Day (Part 1), Joyce sees Buffy packing and asks if she is running away again (”…and you’re taking my clothes”). Buffy ran away after the events of Becoming (Part 2), and stayed away for the whole summer.

In Graduation Day (Part 1), Percy thanks Willow for not kicking his ass in Doppelgängland, when her vampire doppelganger hit him.

In Graduation Day (Part 1), Buffy says that her relationship with Angel will be her “last office romance”. She contradicts this in later seasons with her relationships with Riley and Spike.

In Graduation Day (Part 1) Faith mentions her childhood in Boston, where she describes herself as, unsurprisingly, a tough kid. The Mayor calls her a “firecracker” and she reveals that her mother used to call her that when she was younger. In Touched, the First Evil appears to Faith …

In Graduation Day (Part 1), Willow hopes that Siegfried and Roy might be the speakers at the graduation ceremony. This is a reference to the pair of flamboyant magicians who used to perform with big cats and bad mullets in a spectacular Las Vegas show. They are referenced again in …

Mr. Miller was a teacher at Sunnydale High. He appeared in the episodes I Only Have Eyes For You, Anne (”Slow down, people. Summer is over. Be somber.”) and Graduation Day (Part 1) (Playing hangman: “They always go for the ‘E’”).

In The Prom, we hear Fatboy Slim’s ‘Praise You’ from his album You’ve Come A Long Way, Baby.