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

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

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.