“Whatever they think of you, it shouldn’t matter” - In Primeval, Anya reassures Xander (in her own quirky way) that she loves him. Their relationship lasts until Xander stands Anya up at the alter in Hell’s Bells.

In Primeval, Giles is hungover from his drinking binge in The Yoko Factor.

At some point between the episodes The Yoko Factor and Primeval, Cordelia rang Willow up for help cracking into a computer of her own to find files coded by Wolfram and Hart in Angel’s ‘Blind Date‘. In that episode Willow says “hey” to Wesley - a little in joke as …

Jeff Pruitt (Buffy’s stunt coordinator) and his wife Sophia Crawford (Buffy’s stunt double) left the show at the end of season four. His last huge fight sequence was in Primeval. This was apparently due to ‘creative differences’ with the production team. Jeff later went online to Buffy forums to air …

Spike tells Adam in The Yoko Factor that he killed two Slayers. We heard this first in School Hard, and see Spike relate his story to Buffy in Fool For Love.

Buffy and Willow’s phone in their dorm room keeps changing. In Living Conditions it was a white one with an answering machine, then it changed to a different design in Hush, and in The Yoko Factor, it’s a small, blue phone.

In The Yoko Factor, Giles seems to have been doing some redecorating. When Anya and Tara are in his bathroom, it’s different from how it was when Spike was chained up in it earlier in the season (Something Blue). It actually looks a lot like the bathroom from the house …

In The Yoko Factor, Willow asks Tara about housing for the following college year. The two end up living together in a dorm as Buffy moves home to be with her mother in season five.

In The Yoko Factor, Spike has a new TV in his crypt to replace the one Forrest broke in Goodbye, Iowa. He also has a video, a microwave and an old Nintendo - but no obvious sign of electricity.

In The Yoko Factor, Riley calls Angel “Mr. Billowy Coat King of Pain”. Angel’s long black coat billowing as he walks away mysteriously is a trademark of his.

The Buffy episode The Yoko Factor follows on from an episode of Angel called ‘Sanctuary‘, where Buffy turns up in L.A. to find Faith. She’s disgusted to find that Angel is helping her nemesis, despite what she did to Buffy. Angel and Buffy argue, and she leaves. He arrives in …

The following line of Spike’s was deleted from The Yoko Factor:
“Now that you’ve turned Super Wicca and you’re damn near Amish. All candles and hand-ground herbs…”

In The Yoko Factor, Giles sings “Freebird” until Spike interrupts him. The song was originally written and recorded by Lynyrd Skynrd in 1973. The lyrics Giles sings are:

“If I leave here tomorrow, would you still remember me?
For I must be travelling on now,
‘cause there’s too many places I’ve got to …

In Superstar, Royal Crown Revue play “Hey Sonny (Where’d You Go)” (before Jonathan comes on stage), “Trapped (In The Web Of Love)”, the trumpet solo mimed to by Danny Strong and Jonathan’s fanfare.

In Superstar, Jonathan comes onstage at the Bronze and sings ‘Serenade in Blue’. His singing voice was provided by Brad Kane, who played Tucker in The Prom. The backing band is Royal Crown Revue.