The main theme for "The Firefighter with Heroic Aspirations" sounds extremely similar to the main theme of the 1984 film, 'Ghostbusters'. The connection is likely a nod to the fact that the Ghostbusters' headquarters is located in a firehouse.

After footage of the game's final boss surfaced from pre-release copies, players expressed concern to the developers that some intense rapidly flashing lights and other visuals during the final boss may cause serious seizures to players that have photosensitive epilepsy, and in general may be an eyesore to players that are not epileptic. The developers understood and significantly changed the battle effects in a day-one patch that was heavily recommended by Square Enix to be downloaded by future players.

Several costumes featured in the game's announcement trailer have different names than they do in the final game:
• Tornado Wolf was "Whirling Wolf".
• Inky Blaster was "Cephalopainter".
• Water Blaster was "Super Streamer".