In Get It Done, he Scoobies open a portal using items from an old Slayer bag. Buffy jumps into the portal and meets the Shadowmen who made the First Slayer and discovers how she was made: “First there was the earth, then came the demons, after demons came men, they …

There are a few references to the season four finale Restless in Get It Done: The bag that Principal Wood gives Buffy is the same one from her dream from which she gets mud to cover her face with; When Buffy dreams that she wakes up, she sees the first …

Anya tries to help Buffy get rid of a stain on her shirt in First Date. She says, “it’s blood, or maybe pizza.” In Conversations with Dead People, Dawn ate pizza whilst holding the shirt. She got a stain on it, but said, “Never mind, she’ll think it’s blood”.

In First Date, Xander was originally supposed to ask his demon date Lyssa, “Did you hatch out of a preying mantis egg in the old high school?” This line was deleted - it would have been a nice bit of continuity but confusing as, as far as we know, Xander …

The following lines were deleted from the episode First Date:
Buffy: “In Beverly Hills.”
Wood: “See now, that detail takes the edge off my Little Orphan Robin story, but yeah, that was true.”

David Soloman was the person who moved the Mutant Enemy monster across the screen, which can be seen at the end of every episode.

Drew Z. Greenberg and David Solomon say in their DVD commentary for The Killer in Me that the reason there are no potential Slayers (apart from Kennedy) in the episode is because their budget wouldn’t stretch to allow for the extra actors.

Rif Hutton, who played the shopkeeper who sells Willow/Warren the gun in The Killer in Me, has also been in Quality Time, Halfway Decent, Seinfeld, Children of the Corn III (in which Nicholas Brendon also appeared) and Star Trek: Generations. He did voices for Shrek and played Lt. Commander Alan …

Megalyn Echikunwoke, who played the college Wiccan group leader in The Killer in Me, played Claudia Gibson in For the People and Nicole Palmer in 24. She’s also been in ER, Boston Public, Malibu, CA, Smart Guy and The Steve Harvey Show.

We see in Potential that Willow is able to perform a spell which pinpoints any potential Slayers in the vicinity. The ingredients include snake skin, boiled eggs, chrysalis and tumbleweed. It emits a bright light (and a strong smell of egg) which rushes towards any potential in the area.

In Potential, Andrew says that it’s hard to kill a pig, a reference to Never Leave Me, when he tried to open the Seal by stabbing a pig over it.

Kennedy confirms (sort of) that she is gay in the episode Potential. Rona says, “I’ve gotta go with the stake. It’s a classic. I love the feel of wood in my hands” to which Kennedy replies, “You lost me.”

Giles is not in the episode Potential as he is in Shanghai picking up Chao-Ahn, a new potential Slayer. Also missing is the potential Slayer Chloe, though no explanation is given for this.

Derek Anthony, who played the ‘Imposing Demon’ in the episode Potential, has also been in two episodes of Angel: as a hotel security guard in ‘Dear Boy‘ and “Dying Black Man” in ‘Blind Date‘. He’s also been in Frasier, The Drew Carey Show and The Practice.

In Showtime, Buffy and Andrew mention the 1990 movie Misery starring James Caan (as Paul Sheldon) and Kathy Bates (as Annie Wilkes). It was based on the book by Steven King:

Buffy: “So I’m here to tell you, you try anything, try to run… you ever see the movie Misery?”
Andrew: …