In First Date, Buffy says, “Why does everyone in this house think I’m still in love with Spike?” She’s never said before that she was in love with him, just that she has strong feelings for him - is this an admittance that she loves the vampire? Later, when he …

In First Date, Giles trains new potential Slayer Chao-Ahn using terrifying flashcards, not unlike his pictures seen in Hush.

Willow says in The Killer in Me, “Remember the wacky “I can’t see you, you can’t see me” spell?” This occurred in the episode Same Time, Same Place.

In The Killer in Me, Willow reminds Xander of his famous yellow crayon speech from Grave: “There are other stories from kindergarten. Non yellow crayon stories in which you don’t come out in such a good light.”

Sheila Rosenberg, Willow’s mother, is mentioned by Willow in The Killer in Me (”My mom was all proud like I was making some political statement. Then the statement mojo wore off and I was just gay. She hardly ever even met Tara”). We met Sheila only once in the episode …

At some point during the episode The Killer in Me, Dawn receives a phone call from Angelus that was made in the Angel episode ‘Salvage‘ (when he wants to find out if Buffy is after him in L.A - she’s not but Faith is). This event is never mentioned in …

Willow goes to the UC Sunnydale coven for help when she is turned into Warren in The Killer in Me. This seems a strange choice as she said about them previously, “… just a bunch of wanna-blessed-be’s. You know, nowadays every girl with a henna tattoo and a spice rack …

When Willow becomes Warren in The Killer in Me, she re-enacts the shooting scene from season six’s Seeing Red, when Warren killed Tara and shot at Buffy.

In The Killer in Me, Buffy tries to contact Riley and the Government about Spike’s malfunctioning chip. She last did this in season five’s Out of My Mind, by picking up Riley’s phone and hoping the Initiative would be listening. In The Killer in Me, she gets through to a …

Willow says in Potential that Dawn is made from Buffy’s blood, to which Anya replies, “Yeah, I never got that”. The Summer’s blood connection was previously mentioned in Blood Ties and The Gift. This is also an in-joke to the fact that this mythology was quite confusing and a bit …

In Potential, Buffy traps the power-less potential Slayers in a crypt with a vampire, despite the fact that she strongly disapproved when the Watcher’s Council performed a similar test on her in Helpless.

In Potential, Dawn climbs out of her bedroom window, which we last saw her do in Blood Ties. That was Buffy’s way of escape too, in numerous episodes.

In Potential, Willow gets a phone call from Althanea in the English coven, who helped her after she went evil in season six. The coven has been mentioned previously in Grave, Lessons, Beneath You and Showtime.

In Potential, Xander name-check’s Willow’s old boyfriend Oz to Dawn, “Hell, I could fit Oz in my shaving kit but come a full moon he had a wolfy mojo not to be messed with.”

After Xander accurately realises how she’s feeling in Potential, Dawn says to him, “Maybe that’s your power… Seeing. Knowing.” Coincidentally, Xander is blinded in one eye by Caleb in Dirty Girls. Nice one, Dawn.
Shortly before thumbing his eye out, Caleb refers to Xander as “the one who sees things”. Before …