In "Smart and Smarter", Marge writes Lisa a note that says "You Are Lisa Simpson" to reaffirm Lisa's self-worth. But Lisa then points out that she already has a note that says that, from "Lisa's Substitute".
Simon himself participates in this episode and spoofs his own capricious remarks and assessments of toddlers, including Lisa's younger sister, competing to be enrolled into a school for toddler prodiges.