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* The study group's evil versions cross over from the Darkest Timeline. The timeline was first introduced in "[[Remedial Chaos Theory]]", episode 4 of season 3 after the roll of a die to decide who would collect the delivered pizza.
* a continuity error is present in this episode. Greendale is listed in the closing scene as being "Est. 1974" yet in episode 11 of season 4 "[[Basic Human Anatomy]]" had a student named Leonard who had been at Greendale since 1968.
==Production==
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