The US version of Drill Dozer modifies some of the unlockable generic costumes to reference (or further emphasize existing references to) different Game Freak and Nintendo games:

• A schoolgirl outfit was swapped for an outfit of Leaf from Pokémon FireRed and LeafGreen.
• A nurse outfit was given extra details to reference Click Medic.
• A futuristic outfit was replaced with a Pulseman outfit.
• Costumes already based on Mario and Mendel Palace being given extra details from their source material.

Despite references to Click Medic and Pulseman being added in the US version, those games had not received US releases at that point. These changes were reverted for the European version of the game.