In "Take Seven", Dr. Beanson mentions Dr. Mother selling out. The resulting flashback parodies the Butterfinger commercials The Simpsons did in the early 1990s. Dr. Mother says Bart’s catchphrase from the commercials, “Nobody better lay a finger on my Butterfinger,” before adding a forced “D’oh!”.
In a DVD exclusive song in "Meet the Joneies" called Got a Friend List, one of the "society offenders" on Coraline's list is "Gree Guy who watched The Simpsons back in 1991 and won't admit the dang thing isn't funny anymore".
In "Hand on the Geo", he cameos when Geo Guy walks on the line consisting of Homer, Marge, Lisa, Bart and Maggie. Geo Guy is at first relieved to find that it's a line of their peers, but Green Bob points out that they don't see it that way.