In When She Was Bad, Cordelia says, “Oh look, it’s the Three Musketeers.” The story of The Three Musketeers was written by Alexandre Dumas in 1844, and has been retold many times.

During their game of Guess the Movie in When She Was Bad, Xander says to Willow, “It’s a mad house! A mad…” Oz repeated this line (from the movie Planet of the Apes) in the fourth season premiere, The Freshman.

In When She Was Bad, Cordelia asks Buffy, “what’s with the Joan Collins ‘tude?”. Later, in season six’s Tabula Rasa, Buffy has amnesia and decides to call herself Joan.

In When She Was Bad, Joyce says, “I’ll just be happy if she makes it through the school year.” Buffy is kicked out of school at the end of the school year, in Becoming (Part 2) - making her mother’s fear certain.

At the very beginning of When She Was Bad, we see a courtyard shot of students. It is reused footage from season one’s Never Kill a Boy on the First Date. The guy walking away in the lilac shirt is Owen from that episode.

Sarah Michelle Gellar had her hair cut shorter, and dyed blonder, for her part in the movie Scream 2, which she filmed in the summer between Buffy’s seasons one and two. Xander comments on her new hair in When She Was Bad.

They’re not close friends so how does Buffy instantly recognise Cordelia’s bracelet after it’s thrown through the window in When She Was Bad?

Although never mentioned on-screen, the female vampire in When She Was Bad is referred to as Tara in the script. Willow’s girlfriend in season four onwards was named Tara.

In Superstar, Buffy and Jonathan sit in the Espresso bar talking about Riley. Originally, they were to be walking down the street but the scene had to be moved indoors as it was raining heavily all day. In that scene, Buffy stirs sugar into a cup then hands it to …

In Superstar, Jonathan throws a stake at Buffy and she catches it, when they’re in Giles’s apartment. Originally, Buffy was to fumble with the catch and drop the stake - to highlight how much of an affect Jonathan’s spell had on her, but that scene was changed during editing, for …

“Karen with a K” is seen outside Jonathan’s mansion saying something of the lines of “come on, don’t you ever go home?” She’s then attacked by the monster and goes rushing to the Bronze to find Jonathan for help. If she was such a huge fan, surely she’d know he …

In Out of Mind, Out of Sight, Buffy says the line, “Crush! Kill! Destroy!”. This is a reference to the TV show Lost in Space, in which the same line is said by the robot.

Helen Keller (1880-1968) was mentioned by Cordelia in Out of Mind, Out of Sight (when her boyfriend gets her eye colour wrong). Helen was born deaf and blind but learned to communicate and later became a writer and scholar. Cordy also mentioned her in the Angel episode Blind Date when …

In Out of Mind, Out of Sight, the implication is that Marcie became invisible because of the combination of people ignoring her and the influence of the Hellmouth. But at the end of the episode there are invisible students from other schools. Did those schools have Hellmouths too, or were …

Angel met Giles for the first time in Out of Mind, Out of Sight (”A vampire in love with a Slayer. It’s rather poetic, in a maudlin sort of way.”) and revealed to the Watcher that he could get copies of the Tiberius Manifesto and the Pergamum Codex, which are …