Trivia: Heavy Metal

  • Actor Allusion: In the 1980s TV series V, one of the important characters is a battle-hardened Resistance leader fighting against the Visitors, a group of extraterrestrial lizard-people. In this movie, the main villain is a psychotic human warrior fighting with a group of lizard-men as their leader (see below). Both characters are named Tyler, and both roles are played by Michael Ironside.
  • The Danza: Julie is voiced by Penthouse Pet and B-movie queen Julie Strain. The character is even designed to look like her.
    • Thank Nepotism for that - Strain was married to Heavy Metal's editor-in-chief Kevin Eastman (he of the Teenage Mutant Ninja Turtles, and a co-writer of the graphic novel the film is based on) at the time.
  • Hey, It's That Voice!: The original movie features quite a few alumni of SCTV. Of note:
    • The police desk sergeant, Den, and the robot are all voiced by Uncle Buck himself.
    • Egon Spengler is the green stoner alien, Zeke.
    • Bowser is one of the henchmen during the Harry Canyon sequence.
    • Also in the Harry Canyon sequence, Susan Roman is the Girl.
    • Dean Wormer is the guy prosecuting Captain Sternn.
    • Squidward is Hanover Fiste and Dr. Anrak.
    • You half expect Captain Sternn's lawyer to yell "Ya JACKASS!"
    • Beebe Bluff is Gloria the redheaded secretary.
    • Subverted, however, with Captain Sternn and Edsel the purple stoner alien, who both sound NOTHING like Eugene Levy's natural speaking voice.
    • Maximus IQ Sr. is Grimaldi, the B-17 co-pilot, and one of the barbarians in Taarna.
    • Billy Idol is in the sequel! And Tyler is Darkseid, and Chartog and Zeek are Darph Bobo and Whip, respectively.
  • Suspiciously Similar Song: Elmer Bernstein reworked some of his Heavy Metal score as "Dana's Theme" from Ghostbusters.
  • What Could Have Been: The plot was meant to be connected and more complex than an anthology, but due to the release date being bumped up and a rushed production, the animation had to be done by several animation houses, including CinéGroup and Atkinson Film-Arts. Some of the ideas were Hanover Fiste showing up in So Beautiful, So Dangerous, appearing on Zeke and Edsel's ship, saying "Sternn will go free!" and a sequence linking Sternn and B-17 called Neverwhereland, wherein the Loc-Nar lands on a planet and affecting its development.
    • Kyle Gass had revealed that the director of Kung Fu Panda had approached Tenacious D with an idea for a remake of Heavy Metal. The band was to appear in it as a duo of alien stoners, and they even composed the song "Deth Starr" for the film. Unfortunately, though, the idea never came to pass for fear that an R-rated cartoon would not sell well, so the band ended up releasing the song years later on their album Rize of the Fenix.