Buffy the Vampire Slayer

Buffy: Okay, you're not having one of those mid-life things, are you? 'Cause I'm still going "ick" from the last time you tried to recapture your youth. Buffy is Alluding to the Season 3 episode Band Candy in which chocolates sold in Sunnydale were turning the grown-ups mentally into adolescents. Giles and Joyce, under the affliction of the candy ended up having sex on a police car twice, as mentioned in the episode Earshot when Buffy discovered it.

Xander: That's because he got hit by the Buffinator. Buffy: You think? Oz: No question, he'll be back. "The Buffinator" is a play on the movie "The Terminator", in which Arnold Schwarzenegger is famous for the line "I'll be back."

Giles: A friend of mine recently acquired an original Gutenberg demonography.
This is a reference to Johann Gutenberg who was a German goldsmith and printer. He is often credited with invention of movable type printing, this is a process that made it possible to publish many copies of a single work at one time.

Xander: Wait, are you saying that Buffy's been doing a Linda Blair on us because Kathy's been sucking her soul?
Xander alludes to Buffy's nasty attitude with a reference to Linda Blair, the actress who played the possessed child in the movie The Exorcist. Linda Blair is also the host of "Scariest Places on Earth". They explore haunted areas trying to learn about the world or spirits.

Buffy: She's the Titanic. She's a crawling black cancer.
Buffy's ranting about Kathy includes a reference to the famous shipwreck disaster.

Parker: Uh, I'm not sure, we sort of got caught up talking Red Wings. It turns out that Kathy's a closet hockey fan.
The Red Wings are the Detroit based team of the National Hockey League.

Oz: Stuff like, scorpions? And Bloody Mary minus the Mary?
A Bloody Mary is an alcoholic drink made with tomato juice and vodka. The name is also the nickname of Mary Tudor of England, who ruled for the 5 years previous to Elizabeth Tudor, known as Elizabeth the First. Her hatred of the Protestant religion stemmed from her father's (Henry the Eigth) creation of Anglicanism as a front to cast aside her mother in favor of Anne Boleyn. She was given the name due to her persecution and execution of so many protestants during her reign.

Buffy: Umm, had a cloak on, and glowing green eyes, and skin had a, like, super-bad fake rub-on tan.
Buffy describes the demon's orange skin by comparing it to a bad fake tan. Sunless tanning lotions are supposed to give you a tanned appearance without exposure to the sun or other sources of UV light. The early, cheaper varieties, however, tended to give the skin an orange color.

Buffy: I bet before too long she'll be trip-hopping all over the place.
Trip-hop is a form of moody, downtempo electronic music that originated in Bristol, England. It was very popular with U.S. college students in the late 1990s. Some of the music that appears in Buffy episodes is at least borderline trip-hop.

Buffy: Listening to the best of VH-1 all day sort of put me on edge.
VH-1 is a music video channel (similar to MTV) that targets an older audience. The music on VH-1 is not normally what we'd expect a college student to listen to.

Kathy: I figure, "Stitch in time ..." Buffy: "... catches the worm" Kathy starts the saying "A stitch in time saves nine" and Buffy ends it with the end of the expression "The early bird catches the worm". The sayings have different meanings. Kathy's expression promotes doing work now to save work later and Buffy's is about waking up early in the morning.

Buffy: I'm seriously caffeine deprived. Figured I'd head down to the Grotto and get a Jolt and, you know, do some studying.
Jolt Cola is advertised as having "all the sugar and twice the caffeine". It and Mountain Dew (which is also high in caffeine) are the late night study session drinks of choice on many college campuses.