It's obvious in the first couple of scenes that Sarah Michelle Gellar is suffering a cold. Her voice is hoarse and movements slow, adding a scarf and mug within the dialogue was probably a nod to her feeling unwell without writing it into the script or making it overly obvious to those who miss it.
This is the last episode where Tara is mentioned.
The largely unseen vision quest is implied to be the same one Buffy underwent in Intervention (2001). Giles remarked that someone (meaning Buffy) told the potentials that the vision quest involved dancing the Hokey-Pokey.
Willow's line was cut due to length: "The chip operates on intent, and Spike didn't intend to hurt..."
Kennedy says to Willow: "I dig the way you always turn off the Moulin Rouge DVD at chapter 32 so it has a happy ending". She's referencing the 2001 musical movie Moulin Rouge, starring Nicole Kidman and Ewan McGregor. Chapter 32 on the 2001 DVD release, was titled "32. "Come What May - (Reprise)".