 In the episode "Tom's Rhinoplasty", it is revealed by Principal Victoria that her grandmother died during the events of the episode, in reference to the scene in the 1986 John Hughes film "Ferris Bueller's Day Off", where the nurse informs Sloane of the same news.During the show's first 58 episodes – "Cartman Gets an Anal Probe" to the season 4 episode "Fourth Grade" – Wendy is a third-grade student in Mr. Garrison's class.Starting with the aforementioned "Fourth Grade", Wendy's grade, along with all the other major child characters', transfers to the fourth and remains as such due to the floating timeline of the series.