Among the memorabilia in Comic Book Guy's back room is a model of Bean, Elfo and Luci from Matt Groening's Netflix series, 'Disenchantment.'
A Brodie Knob, allows a steering wheel to be operated with one hand.
In "The Shape of Water" fantasy by Marge, the "Fish man Homer" spits out a Missouri license plate (alluding to stories of sharks swallowing license plates) with the license plate number YABF07, which is the production code for this episode.
Billboard outside of Springfield Elementary: "Moe's Tavern: Where Valentine's Day Never Happened"
Homer and the kids are startled by a cardboard cutout of Xena: Warrior Princess. Xena herself, Lucy Lawless, guest starred in a memorable Halloween episode which heavily featured Comic Book Guy.