The title "Moo Shu to Go" refers to the Jade Wolf--specifically, the restaurant's most popular item, moo-shu pork, and the idea that the bulk of their business comes from making food deliveries and takeouts.
In this episode, and in some others of the first season, the werewolves have clothes on when they transform back into their human selves from their wolf forms. In later seasons, their clothes are ripped during the Change and are thus naked when they turn back.
After Magnus asks Alec out over the phone he comments "Playing hard to get. I like a challenge." This is the exact same thing that Alec says to Magnus after they first meet in the alternate reality in 'This World Inverted'