At the beginning, when Jeremy is casting the spell, he is speaking in J.R.R. Tolkien's "Black Speech." He is saying the words inscribed on the One Ring "Ash nazg durbatulûk, ash nazg gimbatul, Ash nazg thrakatulûk agh burzum-ishi krimpatul", which translates as "One ring to rule them all, one ring to find them, One ring to bring them all and in the darkness bind them."
"DIC" can be seen on the news reporter's microphone. DIC produced The Real Ghostbusters.
In Norse mythology, Ragnarök is a series of future events, including a great battle, foretold to ultimately result in the death of a number of major figures, the occurrence of various natural disasters, and the subsequent submersion of the world in water.
Frank Welker based Jeremy's voice on Elvis Presley. The character's face was then drawn to make the Presley reference more obvious.
The "Dark Entity" is list as "Thing in Clouds" in the episode call sheet.