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- Creator Cameo: William Lustig is a hotel manager near the beginning of the film, and Tom Savini is Disco Boy.
- Filk Song: American Death Metal / Grindcore band Frightmare's "Frank Zito, The Maniac".
- Michael Sembello's "Maniac" (which was featured in Flashdance) was originally based on this film.
- Foreign Remake: O Stragalistis Tis Sygrou, a 1989 Greek remake of the film.
- Hey, It's That Guy!: Yup, that's Tom Savini as Disco Boy.
- Homage: A cover of the 2008 slasher Gutterballs look familiar?
- Prop Recycling: Savini borrowed two "corpses" from his previous works.
- The headless corpse which appears in the end is from Friday the 13 th.
- The doll that was used in the "Disco Boy Scene" was from Dawn of the Dead.
- Similarly Named Works: There are also films from 1934 and 1963 with the name Maniac.
- What Could Have Been: Before his untimely death, Joe Spinell was working on a sequel entitled Maniac 2: Mr. Robbie, which was about a Depraved Kids' Show Host who kills abusive parents of his fans.
- He was also supposed to reprise his role as an another woman-hating serial killer in Maniac Cop 2, which would have connected the movies.