There was an unused piece of music composed for the game for battles with Dr. Eggman. It was later recycled for Sonic the Hedgehog 4: Episode I (2010).
Is the last sonic game featured on the Sega Genesis and the first one on the Sega Saturn.
On the Sega Genesis version, physically hitting the cartridge will trigger a secret level selection menu.
The beginning of the SEGA Saturn Boss theme sounds very similar to the Boss theme from US Sonic CD (1993).