This is the first episode in which the entire crew appears in their pajamas.
We learn in this episode that slapping Dr. Zoidberg in the face is sexual harassment.
The name of this episode may be a reference to The Beatles' song , in which "I am the eggman" is part of the lyrics.
I Am the Walrus The name may also be a reference to Dr. Eggman's Theme from Sonic Adventure 2. Each line of the theme's chorus starts with "I am the Eggman."
The professor reads from a monster manual called Gygaxicon, named after Gary Gygax, the creator of Dungeons and Dragons.
Angus MacZongo is partly based on James Bond (specificallly Sean Connery, who's from Scotland).
When the first sheep are killed and a farmer holds a dead sheep in his arms, he says all the houses of Harry Potter before saying "he killed little Angus!"
The planet Doohan 6 is named for James Doohan, the actor who played Scotty on the original Star Trek series. Owing to Scotty's nationality (Scottish), the entire planet is based on Scottish culture.
When Bender pulled the mask McZongo used to disguise himself as Mr. Peppy, Amy says "Jinkies, he Scooby Doo'd us", a reference to the Scooby-Doo franchise.
Although Fry names the Bone Vampire he adopts "Mr. Peppy," and the creature is referred to as a male, Fry's pet is probably a girl--in fact, the Bone Vampire-species as a whole is probably all-girls, given how the Professor said that the species reproduces asexually (essentially cloning themselves), much like certain species of lizard.
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