In the original version of the game, Kasumi was originally going to have a fighting style based on rapidly spinning. However, the hardware for the Model 2 engine could not handle the speed required for the technique. So the concept was scrapped. The idea was reintroduced when retooling the game for the PlayStation. Since the console was able to support a fast rotating character, a new character was added to the roster with the original idea for the fighting style. This character ultimately became Ayane, in the final game.

The Japanese version of the arcade expansion added story epilogues for each character's ending.

Bass Armstrong is heavily influenced by professional wrestler Hulk Hogan, both in his character design and moves.

Leifang's 14th costume from the Playstation version of the game is a reference to the Pixie from Monster Rancher.

Kasumi's 14th costume from the PlayStation version of the game is a reference to the Angel from Monster Rancher.