In Entropy, a depressed Xander listens to ‘Sao Paulo Rain’ by Tom McRae. Xander was last seen indulging in a teenage moody session to music in Prophecy Girl.

Entropy (the title of a season six episode) is the second law of thermodynamics. It basically means that the more you try to put things together, the more they fall apart.

We met Dawn’s friend Janice Penshaw in the episode All the Way. In that episode, Dawn and Janice lied to their families so they could go out on dates with what turned out to be vampires. Janice is mentioned in several more episodes. In Doublemeat Palace, Dawn mentions that her …

In Hell’s Bells, Halfrek tries to get another wish from Dawn, who first fell for her tricks in Older and Far Away.

At the end of Hell’s Bells, Anya is seen being comforted by her old boss D’Hoffryn. We discover in Entropy that she was made into a vengeance demon again.

At Anya and Xander’s wedding in Hell’s Bells, held at the Sunnydale Bison’s Lodge, Willow is Xander’s best “man”. Buffy, Dawn, Halfrek and Tara are bridesmaids, wearing hideous green dresses (”look at it’s arms!”). No one appears to have been there to give Anya away.

Sunnydale’s zip code (seen in a letter addressed to Buffy in As You Were) is 95037, which is actually for the town of Morgan Hill in the Santa Clara Valley, south of San Francisco.

In As You Were, Dawn gives Willow her drink saying, “Your Arnold Palmer, milady”. An Arnold Palmer is a mix of lemonade and iced tea.

Todd says to Buffy in As You Were, “the next thing you know you’re LBJ handing the house keys over to Nixon.” LBJ was American president Lyndon Baines Johnson, who was President from 1963-69.

Xander refers to to “Nick and Nora Fury” in As You Were. This is a reference to both Nick and Nora Charles, the lead characters in the Thin Man movies and to Nick Fury, the main character in the comics Sgt. Fury and His Howling Commandos and Nick Fury, Agent …

The vampire that tells Buffy she smells in As You Were is wearing the same t-shirt that Sunday’s vampire lackey Tom wore in The Freshman, before he was hit by the Initiative Soldiers.

In As You Were, several previous episodes are mentioned on Riley return. He says that he likes Buffy’s hair, which she had cut in the episode Gone. Buffy mentions the time when the gang couldn’t leave ther house (Older and Far Away). Buffy talks about the trio of geeks and …

In As You Were, Anya says to Xander, “Will you stop wolfing down those chips? One more bag and you’ll pop right out of your cummerbund.” We see Buffy struggling to get Xander into his cummerbund in Hell’s Bells.

In As You Were, Buffy sings the Doublemeat medley tune, first heard in Smashed and later in Doublemeat Palace. The lyrics are: “Get the double treat, that’s the double sweet, oh it’s hard to beat, when the meat meets…”

Daniel Wilson, who played one of the Shadowmen in Get It Done, has also been in Almost Famous, River Street, Bloodfist and Wait Until Spring and Bandini.