Faith returns to Sunnydale in season seven’s Dirty Girls, after leaving in Who Are You?. She meets Spike again, but naturally he doesn’t recognise her as the last time they met she was in Buffy’s body. She reminds him when they chat in Buffy’s basement and he tells her he …

In Who Are You? Willow says, “You didn’t sense a hyena energy at all, did you? Because hyena possession is just… unpleasant.” She’s referring to The Pack, when Xander was possessed by a hyena and became violent and mean.

The episode Who Are You? was clearly influenced by the body-swap movie Face/Off, starring Nic Cage and John Travolta. Producer David Fury wanted to call the two-parter ‘Faith/Off’.

It is rumoured that Faith was supposed to tell Riley about the whole complex Buffy/Angel relationship when she was in Buffy’s body in Who Are You? It was edited out of the final script because rumours of this got out to fans before the episode aired.

There were six drafts for the script for Who Are You?

In This Year’s Girl, the Watcher’s Council send a tough retrieval team to get Faith and take her back to England. Giles describes them as “This is a special operations unit. They handle the Council’s trickier jobs: smuggling, interrogation… wetworks.” The team include Weatherby, Collins and Smith.

When Buffy drives out of the Council’s warehouse in Who Are You? you can see cans of film in the corner. The scene was obviously filmed in a studio building.

The last four digits of Joyce’s credit card (read out by Faith in Who Are You?) are 6447 and the expiration is 05/01.

When Faith is in Buffy’s body, she flirts with Spike, and there’s a lot of sexual tension between the two. This is the beginning of his obsession with the Slayer.

Rick Scarry, who played the Sergeant in Who Are You?, comes from Delaware, Ohio - the same town as Claire Kramer. He has been in Dating Games People Play (as George), Down with Love (as the narrator), The Sure Hand of God (as Sam Wiggins), The Man Who Wasn’t There …

The opening credits in Who Are You? name Sarah Michelle Gellar as Faith and Eliza Dushku as Buffy.

In her dream in This Year’s Girl, Faith’s shirt has three white doves on it. Doves are the traditional symbol of peace.

Who phones Buffy to tell her that Faith is awake in This Year’s Girl? And why do they phone her at Giles’s house? And why was the phone call so fast?!

In This Year’s Girl, Buffy calls Riley “the clean marine”, a quote from the 1983 movie The Right Stuff.

Sarah Michelle Gellar appeared in the movie I Know What You Did Last Summer in 1997. There are a couple of possible references to this film in Buffy. In Bewitched, Bothered and Bewildered, Angel sends Buffy a bunch of roses with a card reading, “Soon”. This could be a reference …