 Jane Boursaw of AOL 's TV Squad wrote , " Another great episode tonight , and some of the little symbols we see leading into commercials were actually in tonight 's episode , " referring specifically to the hallucinatory butterflies and the frogs / toads found in the basement . Andrew Hanson of the Los Angeles Times took notice here of the pattern of Easter eggs teasing the next episode of the series . This feature of the show had earlier been touched on in an interview with showrunner Jeff Pinkner . As an example , the previous episode " The Equation " had contained a shot of a butterfly on a trashcan , foreshadowing the hallucinated butterfly attack in this episode . 
