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Trivia: It has been several weeks since Katherine took over Elena's body.
Damon: Uh-huh, she is brilliant.
Stefan: We haven't noticed that Katherine has been inhabiting Elena's body for weeks and that's all you have to say?
Stefan: And you realize that it was Katherine who broke up with you, it wasn't Elena?
Stefan: Right, so, your little murder spree with Enzo where you killed Aaron, you nearly killed Jeremy, you tried to kill Wes but you got infected with that ripper virus...that was all you reacting to Katherine.
Damon: I'm trying to figure out why you decided to tell a starving, blood-thirsty, vampire-feeding ripper that his nemesis is still walking around alive and well while I'm stuck in this cell and can't do anything about it.
Stefan: I have it under control.
Damon: I'd love to hear this.
Caroline: Katherine is a passenger in Elena, except it's worse because none of us seemed to notice.
Tyler: She was at my house, how did none of us figure it out?
Caroline: Because it's Katherine and she's smart and conniving and sneaky and we're the worst friends ever.
Damon: (about blood) I need more.
Stefan: Too bad.
Damon: That was nothing.
Stefan: That was exactly four ounces. When you were out killing vampires you said one vampire kept you good for eight hours, so our friend Caroline did a little bit of math--
Stefan: Relax, she had a calculator.
Caroline: I was sleeping three feet away from her, she picked out my bitter ball dress and I let her use my toothpaste.
Stefan: Yeah well, did she lure you into a hotel room to make out with you?
'Gone Girl' could be a reference to a number of things. 'Gone Girl' is the title of a novel by author Gillian Flynn
and an album by American singer Johnny Cash
The Wolf Man:
Damon asks Tyler if he can ask him a question without him "going all Wolf Man" on him.
'The Wolf Man' is the title of a film from 1941 by Curt Siodmak
The Karate Kid: Liv calls Bonnie "Mr. Miyagi" when she is doing the locator spell.
Mr. Miyagi is the name of a character from the 1984 American film 'The Karate Kid,' played by Noriyuki "Pat" Morita.
When Damon sneaks up behind Wes and takes his phone, he says to him "What's up, Doc?"
"What's up, Doc?" is a line made famous by the cartoon character Buggs Bunny on 'Looney Tunes