The game's data contains an unused red version of the Squeaker enemy, which acts as a more mobile variant of the green Squeaker. These red Squeakers are present not only in isolation, but also in some of the game's similarly inaccessible debug rooms. Given that they are fully coded and that red Squeakers are only normally visible in the Squeak Squad's introductory cutscene and in the Smash Ride sub-game, this implies that they were removed from the main game's levels relatively late into development.