When Harvey (Gabriel Macht) is listing the three options, he ends on his middle finger, flipping the guy off.
First use of the term "You've been Litt up," which continues to be used and become more important throughout the series.
Although Rick Hoffman is allergic to cats, in the show he is definitely a cat lover.
There are three absolute requirements for a valid contract: agreement (not offer and acceptance), consideration, and an intention to create legal relations. It is more likely that the napkin would demonstrate a lack of intention to create legal relations. An absence of vitiating factors, such as duress, is also a requirement (which also applies in this matter).
When Harold tells Rachel he doesn't get ballet, Louis tells him Zoe Saldana was a ballerina. Amanda Shull, who would go on to play Louis' associate, played Zoe Saldana's roommate in a movie about a ballet company in the movie Center Stage.