This page details bugs of Sonic Jam (Sega Saturn).
Collision Glitch#
Watch on YouTubeBy jumping at the waterfall's invisible collision by a certain angle, you can clip out of bounds allowing you to walk in a vast empty space. If you walk far enough, the level then cycles the floor without the scenery and the sky's movement will begin to glitch, causing it to move erratically.
(Source: darkmessenger84)