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The sketch of Grandpa in Dr. Harris's office appeared in an earlier episode - "Grandpa The Ripper" from season 2.
In this episode the sketch is said to be from when Grandpa posed as an artist's model for extra cash while at College.
Grandpa hopes that: "the newd ones never surface!"
In "Grandpa The Ripper" the sketch appeared on TV as an artist's impression of the new Jack The Ripper killer who was stalking the residents of Mockingbird Heights.
Via flashback, Eddie and Matt are shown to have been rivals since young childhood. This directly contradicts the previously established fact that the entire Munster family awoke from a 22-year stasis approximately two years prior to this episode.