Adam Busch, who played Warren, talked to Entertainment Geekly about playing a nerd:
“I had to do a lot of research and find out how to play Dungeons and Dragons. The first scene we ever shot together - me, Danny and Tom - was that first shot, when we sat …

In Flooded, Giles says he has a flat in Bath in England. This is an in-joke as Anthony Stewart Head, who plays Giles, lives in Bath in real life. He decided to spend more time there with his family during season six which is why we don’t see as much …

In Flooded, Buffy suggests she burn her house down for the insurance. She says, “plus fire? Pretty.” In Graduation Day (Part 2), Buffy said to Giles “fire bad, tree pretty”. She also said the line, “fire bad!” in Beer Bad.

M’Fashnik demons (pronounced mmm’Fashnik, like “mmm-cookies”) come from a long line of mercenary demons that perform acts of violence and mayhem for the highest bidder. The demon in Flooded robbed a bank for the trio of nerds and tried to kill Buffy.

In Flooded, Anya mentions the engagement ring Xander gave to her in The Gift.

In Flooded, Warren refers to ‘parsecs’ which are units of astronomical length equal to 3.258 light years.

In Flooded, Andrew wears a t-shirt depicting ‘Big Mel’, who is the mascot of writer and director Doug Petrie’s favourite comic book store - Meltdown in Los Angeles.

In After Life, Spike says angrily, “Magic always has consequences. Always”. This turns out to be the theme for season six as Willow becomes addicted to magic and loses everything to it.

In After Life, Xander talks in pig Latin, which is a simple code. You take the consonant off the front of words which begin with a single consonant and adding it to the end of the word. Then add ‘ay’ after the consonant: Buffy becomes ‘uffybay’. If the word has …

Willow calls Giles in After Life to let him know that Buffy is alive. He left Sunnydale to live in England in Bargaining (Part 1). Willow says he was, “kinda weirded out. Lots of “dear Lord’s”. I think I actually heard him cleaning his glasses.”

Lisa Hoyle who portrayed the hitchhiker demon in After Life is a stunt woman, who has done stunts for Austin Powers: The Spy Who Shagged Me (featuring Buffy’s Seth Green), Pearl Harbour and Charlie’s Angels.

The U.K. video boxsets split the episode Bargaining into its two separate parts. Each one had a set of credits at the beginning of the episode. The DVD release then combined the two episodes together again.

The music playing during the scene where Willow kills the deer in Bargaining (Part 1) is called “Willow Stabs Bambi”.

When we see the vampires riding to Sunnydale on their bikes in Bargaining (Part 1), the song ‘Permanence’ by Static-X can be heard.

The music from Buffy’s death scene in The Gift is called ‘Sacrifice‘. It was written by Christophe Beck, and appeared on the soundtrack CD to Once More, With Feeling.