If the player hits a Power Sneakers item box in any of the Sonic games, a higher-pitched version of the theme is played instead of a sped up version.

Originally, the games Sonic Spinball, Sonic 3D Blast and Dr. Robotnik's Mean Bean Machine were to be included as part of the collection, however, they were cut from the game during development.

This would explain why sprites from Sonic Spinball and Sonic 3D Blast can be seen in the game's credits.