The music that plays during Sunset Hill Zone is a remix of Green Hill Zone's music from the very first Sonic the Hedgehog game.

This is the last game for which Deem Bristow recorded the voice for Dr. Eggman, though some of his clips were reused in Sonic Riders and Sonic Riders: Zero Gravity after his death in 2005. This is also the last Sonic game to use the original English voice actors before being replaced with the 4Kids Entertainment voice actors.