Alison is Will's cousin from Los Angeles.
Will and Karen's book is called "The Marriage of Equals" by Rita Pigeon.
Jack: (About Will) He doesn't respect me.
Karen: Ooh, I've got a nice idea. Why don't we be cold and bitchy to him? You know, like I was to the losers on the playground when I was a kid ... and yesterday at Olivia's kick ball game.
Karen: I did not understand the part where Diane blacked out in the middle of an argument, and woke up spooning her maid.
Will: What? (Realizes) She didn't, you did.
Karen: Yeah, that makes more sense.
Jack: We're gonna go to Bea Arthur's one-woman show and yell out "Maude!"
Bea Arthur played the title role in the 70s sitcom Maude.
Will: Just give me a signature. The sooner you get that over with, the sooner you two Heathers can get back to your Heathering.
Jack and Karen had been whispering derogatory remarks about Will to each other. Will's response is a reference to the 1989 film Heathers, in which three high school girls (all named Heather) insult other, less popular girls.