Spike makes mention of his mother's personal physician - a Dr. Gull. This is Dr. William Gull, Physician-in-extraordinary to the royal family, and who some believe was Jack The Ripper.
In the unedited version, Giles revealed to Buffy in the graveyard that he murdered Ben to stop Glory resurfacing, however this was cut just before broadcast.
Willow receives a telephone call from Winifred Burkle, causing her to go to Los Angeles in Orpheus (2003).
Nikki Wood (Principal Wood's mum) is seen before in Season 5 Fool for Love (2000) but it is a different actress than in Season 7.