After defeating a boss in the international version, the player has to collect 13 continue icons in order to get a continue. In the Japanese version, however, only 10 continue icons are needed. In addition to this, the international version starts the player with no continues, while the Japanese version starts with two.
Contributed by Mr. Kite
During the fight with the first Keymaster, Mad Dog, a 16-bit rendition of Pyotr Ilyich Tchaikovsky's "Nutcracker March" plays in the background.
Contributed by Kitsune Hawk
Many of the levels are named after popular movies and other media titles:
• "Toys in the Hood" is named after Boyz in the Hood.
• "Clothes Encounters" is named after Close Encounters of the Third Kind.
• "Terminate Her Too" is named after Terminator 2.
• "Stair Wars" is named after the movie series Star Wars.
• "Spinderella" is named after Cinderella.
• "Fly Hard" is named after Die Hard.
• "Headdy Wonderland" is named after Alice in Wonderland.
• "The Rocket Tier" is named after The Rocketeer.
• "Illegal Weapon 3" is named after Lethal Weapon 3.
• "Far Trek" is named after the movie and TV series Star Trek.
• "The Escape" is named after The Great Escape.
• "Mad Dog and Headdy" is named after Mad Dog and Glory.
• "Mad Mechs" is named after Mad Max.
• "Heathernapped" is named after Kidnapped.
• "Towering Internal" is named after The Towering Inferno.
• "The Flying Game" is named after The Crying Game.
• "Twin Freaks" is named after the TV series Twin Peaks.
• "Fatal Contraption" is named after Fatal Attraction.
• "Finale Analysis" is named after Final Analysis.
Contributed by G-Haven