Scenes of "Science Fiction Parody" are later featured in "And Justice for None" as a flashback sequence. However, it is an unsaid rule that if cartoon character(s) are to appear after being destroyed in an episode, that they are not to remember any happening of the one in which they were destroyed. In the case of "Science Fiction Parody," the Earth exploded - therefore everyone was destroyed (other than the Narrator). Therefore, none of them should be aware of the happenings of that episode. And for the record, this rule does not apply to video game characters, especially villains.
One alien mispronounces "leader" as "leaver."
(Sniz bumps into a fortune teller and they both fall down)
Sniz: Oh my gosh! I'm sorry.
Fortune Teller: I will curse you! (Sniz starts to shake) But since you already apologize, I only curse clay. (Points to the clay that Sniz is holding)
Sniz: (Laughs falsely; as he walks away) Nutjob...
(Henry and June are celebrating their 100th episode)
June: Wow. One hundred episodes. How does it feel, Henry?
Henry: "KaBlamtastic", June. Not many television shows have had the stamina, excellence, or gurth to make it to episode one hundred. Why it seems like only yesterday, that two wide eyed kids came out on the stage and-(Crew man comes out and whispers to Henry and June, then walks away)
June: I thought you were counting.
Henry: Oh yeah! It's always my fault, isn't it? Something goes wrong, and it's always Henry, Henry, Henry!
The laugh June's action figure gives Henry's sounds similar to Nelson Mutz's laugh (ha-ha!) on The Simpsons.
The patterns on Fondue's blanket contain the Death Star, TIE Fighters, and X-Wings from Star Wars.