The initial release of the arcade version suffered from several gameplay affecting bugs. If any of these bugs relating to Hwa Jai, Vice, and Ralf were triggered during a tournament, the player who executed them would either be disqualified or need to reposition themselves on the stage.
Contributed by DrakeVagabond
There are audio files hidden within the game that feature English voices for most of the characters. Many of the voices are reused audio from The King of Fighters XII. However, characters who weren't in the previous game were also going to receive English voice dialogue. The English voices were not a feature in the final game.
Contributed by DrakeVagabond
Ralf Jones' "Jet Vulcan Punch" move is based on Monkey D. Luffy's 'Gomu Gomu Jet Gatling' move, while using his Gear Second form from Shonen Jump's series One Piece.
Contributed by ProtoSnake