Justin's "Free Claire"-shirt is inspired by the "Free Martha"-shirts, which became famous when Martha Stewart was imprisoned in 2004.
One learns that Mark's real last name (i.e. his birth name) is Mark Weiner, not St. James, when his mother visits.
First appearance of Max Greenfield who plays Nick Pepper. Later, on the show New Girl, Max Greenfield's co-star Jake Johnson plays Nick who often pretends to be a detective named Pepperwood.