Buffy references ex-Principal of Sunnydale High in Him when she says to R.J: “I was kinda juggling some stuff when I was in high school, too. Which was also very recent. Principal Snyder was always on me.”

Dawn wears Buffy’s cheerleading outfit to the tryouts in Him. The outfit was last seen in The Witch and dies it’s death in Him when Dawn rips it up in fury.

In Him, Xander agrees, very reluctantly, to allow Spike to stay with him in his apartment. This isn’t the first time this has happened. Spike lived in Xander’s basement briefly during season four.

In Selfless, Buffy stands up to Xander when she thinks she must kill Anya. She says, “I am the law”. In Consequences, she didn’t agree with Faith’s argument that, as Slayers, “We don’t need the law - we are the law”. It’s a symbol of Buffy’s changing attitude to her …

Willow met D’Hoffryn in Something Blue, when a spell she did impressed him and he offered her a job as a vengeance demon. She refused, but he left a talisman with her so that she could contact him if she changed her mind. She uses this to summon D’Hoffryn in …

In Selfless, Anya says that Buffy should know better than to think a sword through the chest would kill a vengeance demon. Buffy witnessed a demon shove a sword through vengeance demon Halfrek with no serious effect in Older and Far Away.

Both D’Hoffryn and Spike say, “From beneath you it devours” in Selfless, a reference to the coming evil first mentioned in Beneath You.

In Selfless, Anya says to Buffy, “Are there any of your friends you haven’t tried to kill?” Buffy tried to kill Xander, Tara, Willow and Dawn in Normal Again; Spike on several occasions; Willow in Grave; Faith in Graduation Day (Part 1); Angel in Becoming… Need I go on?

In Selfless, Spike says that Drusilla liked to look at the stars. We saw her doing this in Innocence:
Drusilla: “I’m naming all the stars.”
Spike: “You can’t see the stars, love. That’s the ceiling. Also, it’s day.”
Drusilla: “I can see them. But I’ve named them all the same name. And there’s …

In Amends, the First as Jenny says, “I wanna die in bed surrounded by fat grandchildren, but guess that’s off the menu.” In Chosen, Buffy tells Angel, “No I don’t see fat grandchildren in the offing with Spike.”

The end sequence of Forever is very similar to W.W. Jacobs’s short story The Monkey’s Paw. In the story, the wife (Dawn) wishes (casts a spell to bring) her son (mother) back from the dead, he (she) appeares at the door, wife (Buffy) rushes down and throws open the door, …

When Buffy’s co-worker is showing her how to work on the grill, we see that he’s wearing plastic gloves. Then he puts two beef patties on the grill and he suddenly isn’t wearing gloves. In the next shot there are now four burgers on the grill and he’s wearing gloves …

At the beginning of Bargaining, the camera pans up to Willow, who is on top of a crypt in the graveyard. You can see what seems to be a part of the camera on the very right of the screen

As Buffy is fighting the newly-risen vampires in the basement, she stakes the vamp in the blue shirt on the wrong side of his chest.

When Buffy, Willow and Angel are on the roof of City Hall, Buffy hands Willow a book to begin her spell. You can see that she opens the book twice in different shots.