Sometimes when entering as Chang, you will be fluffed and spawn in the sky. This only happens in the Dreamcast version.
In the original version, the ship lacks cat scratches to reach the upper area with the Energy, Thermal, and Smart, despite being present in earlier versions of the game. However, it is still possible to get up there.
Despite this, the scratches are present in a prototype.
In Viggo's Revenge, when leaving the hub world for the first time and returning to the village, you will instead emerge out of the gates to the City of Fear. This can be confusing for first time players as they may not know how to return to Viggo A Gogo due to not seeing the exit.