From the episode Seeing Red until the end of this season’s finale Grave, all events occur within around 24 hours. According to Tara’s grave in Help, these episodes occur between May 7th and May 8th 2002.

Several scenes from Seeing Red were cut out during it’s first airing on the BBC in the UK. The attempted rape of Buffy was cut from where she falls and hits her back on the shower to where she finally kicks him away. The exit wound appearing on Tara’s chest …

Parts of the episode Seeing Red were filmed at Six Flags Magic Mountain theme park in California (when the nerds try to break into a armoured van). The banner at the amusement park which reads “Opening Weekend” is the same font and colour as the Once More, With Feeling logo.

Marti Noxon said about the episode Seeing Red in the SFX Year End Collector’s Edition (written by Edward Gross):
“We really wanted to make it pretty brutal and scary. It think the whole episode makes you feel like things are going in one direction and then, kablooey, they go in …

During a Buffy convention in London in June 2003 (’The Harvest‘), James C. Leary, who played Clem, said how difficult it was to film the scenes in Seeing Red with James Marsters as his character had only been in comical scenes before.

In When She Was Badm we hear Alison Krauss & Union Station’s ‘It Doesn’t Matter’ as Angel leaves Buffy’s bedroom (from the albums So Long, So Wrong, and Buffy The Album). In Entropy, we hear ‘That Kind of Love’ by Alison Krauss, after everyone argues about Spike and Anya.

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.