This is the first appearance of Mike Hora in the series.
Misspelling on the classroom blackboard: "triggernometry" (alongside an illustration of a horse and cowboy). The visual allusion is to Roy Rogers, singing cowboy star of film, radio and TV, and his horse, Trigger.
Even though this is her 58th appearance on the show, this is the first time Lisa Ruddy has had water dumped on her.
Kevin Kubusheskie is the first dungeon prisoner to say the catchphrase "Blue skies! Barthie burgers! Girls!"