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There are many unused or unfinished vehicles in the game's files. These include a motorcycle with a sidecar, two monster trucks, a bulldozer, a tank, a tractor, and even modern day vehicles.
Contributed by ClaudX
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The Palermo Club originally had a much different appearance than in the final game.
Contributed by ClaudX
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Tommy originally wore a different outfit in the chapter "Election Campaign".
Contributed by ClaudX
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Spoiler:Paulie's death in the final chapter, "The Death of Art", was revised multiple times, but all versions originally had Paulie lying dead on his bed, and not near the door.
Contributed by ClaudX
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Paulie had a very different facial appearance during development, along with a brown suit.
Contributed by ClaudX