The name of the restaurant they eat at when Cass announcers they're all going to Gencon is called the AFK Cafe. AFK is gamer speak for Away from Keyboard, and refers to the time when a gamer steps away from their keyboard but leaves the game running.
Toward the end, when Gary is mourning the loss of his favorite show, the very last line of lyrics "...you can't take the sky from me," along with the music change he plays on the guitar, are a real-life tribute to a show that was canceled and that is mourned by fans still to this day: Firefly.
During the hotel scene where half of the party is waiting to begin playing, Lodge and Joanna are absent. Though the movie does not directly state as such, it is heavily implied that the two are having sex offscreen.