In the final game, Sonic wore SOAP shoes instead of his buckle shoes seen in previous games. However, during development, Sonic was shown to still be wearing his buckle shoes. This can be seen in early screenshots, and the E3 2000 trailer. Remnants of this can be seen in the final game. In the first cutscene of the Hero Story, when Sonic jumps out the helicopter, he is wearing the buckle shoes, but by the end, he is wearing the SOAP shoes. This error was fixed in the GameCube port.
Contributed by Takahashi2212