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You're not its Kate's Cop buddy in Sanctuary who makes the reference based on her suddenly believing and she picks him up on the fact than Mulder was actually the believer. The Buffy X-Files reference is in the Pack.
Cordy: "Oh, they'll be into this for a while. We still have time for a cappuccino and probably the director's cut of 'Titanic'."
Later when they are in the sewers looking for the Mohra demon, Buffy says:
Buffy with a sigh: "I know. I do, too. I mean, I only came to see you so I could tell you face-to-face not to see me - face-to-face anymore, - and I know there is a fly in the logic ointment here somewhere, but.. The next thing I knew we're being attacked by this mutant ninja demon thing, and then we're on the floor on top of each other, and it's just really confusing being around you."
This refers to the Teenage Mutant Ninja Turtles, a popular comic character and movie.
I might be wrong on this one but in AtS S3E19 "The Price", I'm pretty sure that when Groo goes to carry Fred to the hospital, Gunn says "Put her down Slater", which may be a Saved by the Bell reference?