The t-shirt Georgie wears throughout much of the episode is an Iron Maiden shirt displaying artwork related to their 1984 single, "Aces High".
One of the prizes that Sheldon wins for correctly answering Bible questions is a "John the Baptist pencil topper", which looks like a little plastic head placed over the eraser. This is an inside wink for Christians, as John the Baptist was beheaded.
In A Baby Tooth and the Egyptian God of Knowledge (2020), Georgie inadvertently insults Dale about the '70s music that he plays in the store, calling it "granddad music" and asking if he can play something else. Yet, in this episode, one of Georgie's delights is to get a '70s-era lava lamp for his van interior.