Here’s the prop direction for Xander’s ID in Beer Bad: “FAKE I.D. showing Xander with a big Tom Selleck moustache.”

The shot of Sunnydale campus shown at the start of Beer Bad is the same one used in The Freshman. You can even see Buffy walking up the middle of the screen holding the folder and wearing the dress she wore in that episode. The same shot was reused in …

Spike makes his final appearance as a vampire who is able to kill in Wild at Heart. From that episode on he’s disabled by either a chip or love.

As the school library was blown up in Graduation Day, Oz’s new wolf-cage, seen in Wild at Heart, is in an underground crypt in one of the local cemeteries.

Giles goes to the Bronze in Wild at Heart and the gang react with shock. He was there previously in Welcome to the Hellmouth when he was looking for Buffy; and in Surprise, at Buffy’s birthday party.

Seth Green left the show after the episode Wild at Heart. He was due to leave a little later in the season but a heavy work schedule made him pull out earlier than expected. The relationship between Oz and Veruca was therefore supposed to go on a little longer than …

In Fear, Itself, ‘Ow Ow Ow’ by Third Grade Teacher as people arrive at the party.

In Fear, Itself, Giles says, “It’s alive!”, which is from the 1931 movie Frankenstein. Buffy’s “Fire bad” line in Beer Bad also comes from that movie. The monster in the movie (played by Boris Karloff) is chased by angry villagers with torches, when he shouts, “Fire Bad!”
In Goodbye, Iowa, the …

The title of the episode Fear, Itself comes from American President Franklin D. Roosevelt’s inaugural address, on March 4th, 1933. He said, “This great nation will endure as it has endured, will revive and will prosper. Let me assert my firm belief that the only thing we have to fear …

In Fear, Itself, Gachnar tells Buffy, “They’re all going to abandon you, you know.” They do: in season seven’s Empty Places, when everyone chooses Faith over Buffy. In the same episode, Oz is scared of the wolf within him and Willow screams, “don’t leave me” to Oz. Both these fears …

Willow refers to the events of the episode Gingerbread when she says in Fear, Itself, “I’m Joan of Arc. I figured we had a lot in common, seeing as how I was almost burned at the stake…”

In Fear, Itself, Xander refers to the season two episode Halloween in which the Scoobies were turned into their costumesHe says, “Bond. James Bond. Insurance, you know, in case we get turned into our costumes again. I’m going for cool Secret Agent Guy.”

In Fear, Itself, Joyce opens up to Buffy a little about her life post-Hank. She says, “It certainly didn’t help that my last boyfriend turned out to be a homicidal robot”, referring to Ted Buchanan, her boyfriend in the episode Ted.

We saw the Initiative soldiers for the first time in The Freshman. The Scoobies saw them for the first time in Fear, Itself, but attributed their attire to Halloween costumes.

According to Xander, Halloween during Fear, Itself would be the second annual Halloween video screening, implying that the Scoobies watched videos the previous year. There was no Halloween episode in season three, so this makes sense.