The game includes unused graphics for miniature versions of the unknown soldiers, most likely intended to be used as extra lives or other bonus pickups.

The game has six unused audio files, three music tracks and three voice lines for Sylphie.

Sylphie has two unused animations; one where she is talking and another one where she is smiling.

The game was released as 'Lost Worlds' in Japan and had a more mechanical looking logo, and a unique font for the Capcom copyright information.
The Japanese title screen also doesn't include the high score shown on the international release.

Sylphie bows to the player when her shop is entered in the Japanese version and greets them with vocals, whereas in the western release, she is silent and does not move.

The Item Shops have animations where their doors open. These animations go unused in the final product.