Characters mentioned: Homestar Runner, The Cheat, Strong Sad, Bubs, Marzipan, The King of Town, Videlectrix and Limozeen.
When waiting for the Player to act Strong Bad says "This is more boring than one of Homsar's Late Night Jenga Jams". This is a reference to both "Where's The Cheat?" -where Homsar, for some reason, calls Connect 4 a Jenga Jam- and to Strong Sad's Lament where Strong Sad complains about Homsar's Jenga Jam Parties.
When asking Heavy about his favorite movies Strong Bad mentions "Fists of Knuckles", a triple R rated movie from the Strong Bad email rated.