In the parking lot behind the Liberty Tree building in Bedford Point, there is a hidden sign, showing a handwritten message and Rockstar Leeds' signature smiley. The PlayStation Portable version says: "Hello again!", while the PlayStation 2 version says "You just can't get enough of this alley, can you?". The sign can be found by jumping over the walls around the lot using a tall vehicle.

In the PSP version of the game, if the player continues the side mission, Car Salesman, after level 6 and reaches level 9, a snowy weather effect starts to appear and continues appearing in further levels. This is possibly there to make driving more difficult. The snow disappears if the player fails or cancels the mission, and Car Salesman cannot be played again afterwards, so you can only see this once. This weather effect does not appear in the PS2 version of the game.

An unused HUD icon for a Ruger Autoloading Rifle can be found in the data of the PlayStation 2 version of the game. It was most likely cut early in development due to the unfinished state of the icon.

Within the game's data is a cut vehicle named the "Tommy". Its files are still present within the mobile release. The file names suggest that it was based off of a Mini Cooper.