Michael and Jan officially make their romantic relationship public in this episode.

Owen Daniels, who plays David Wallace's son, is the son of producer Greg Daniels.

Poor Richard's Pub is an actual pub in Scranton. The pub has been mentioned several times throughout the show. In a strange bit of irony, the owner of the real Poor Richard's Pub doesn't like the show.

Roy finds out about the kiss between Pam and Jim.

Dwight: The chimney's in decent shape. Not great. I found some termite damage in a crawl space, and some structural flaws in the foundation, so, all-in-all, it was a pretty fun cocktail party.

Pam: I have decided that I'm going to be more honest. I'm gonna start telling people what I want directly. So, look out world, 'cause ol' Pammy is gettin' what she wants. And, don't call me Pammy.

Michael: Actually, it's polite to arrive early, and smart. Only really good friends show up early. Ergo de facto, show up early, become a really good friend.

Roy: I am gonna kill Jim Halpert.

Jan: Why is this so hard? That's what she said. Oh my God, what am I saying?

Creed: I run a small fake-ID company from my car with a laminating machine that I swiped from the sheriff's station.

Jan: I am taking a calculated risk. What’s the upside? I overcome my nausea, fall deeply in love, babies, normalcy, no more self-loathing. Downside - I date Michael Scott publicly and collapse into myself like a dying star.

Jan and Michael arrived at the party in separate cars, yet Jan rides home from the party with Michael and Dwight.

Michael: Here's to Mr. Iococca, and his failed experiment, the DeLorean.

This is a reference to the former CEO of Chrysler, and the DeLorean brand of cars which were popular in the mid-1980s.

Dwight: Do you ever watch Battlestar Galactica?

Battlestar Galactica is a science fiction show that has been airing on the SciFi network since 2003.

Karen: Yeah, I’m the only one left. Everybody else was either fired or quit. And there’s one in anger management.

Karen mentions that one of her fellow co-workers was in anger management, which is a reference to Andy, who was sent to anger management after punching a hole in the office wall in the episode "The Return."

Pam: Just listen. Remember that casino night, about a month before we were supposed to get married? I kissed Jim.
Roy: What?
Pam: He told me how he felt, and I guess I had feelings too, and we kissed.

Pam is referring to the events that took place in the Season Two finale, "Casino Night."