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: …

In Showtime, Buffy asks if the Turok-Han can be destroyed with germs. This is a nod to season three’s big bad, the Mayor, who had a fear of germs.

Andrew asks Dawn in Showtime if she wants to “play Kevin Bacon”. Six Degrees of Kevin Bacon is a game that attempts to connect any actor to the prolific Kevin Bacon in six steps via his co-stars.

In Showtime, Xander says the new public library is due to open in May 2003. This is, of course, an in-joke as Sunnydale is destroyed at that time.