It uses some new scenes in the intro while missing Robotniks face on the mountain that was Included in the Mega/SegaCD version of the FMV. It's also missing the Missing R2 Level that they added in the ending clip of Sonic CD for Sonic Jam (Saturn) and Sonic Mega Collection (GC). If you don't know what clip it is look at the end of this video. There will be sonic stumbling then almost getting bitten by a underground enemy. Then Check out the Saturn or Gamecube version of the Ending.
PS: If you own Sonic CD for PC or have D.A. Garden unlocked look at the loading screen. There is a area with cactus on the planet. Could this have been R2? There was also supposed to be a Sand lv in Sonic 2 (its unfinished in the Sonic 2 Prototype) and Sonic CD and Sonic 2 for SMS/Genesis/GG we
re supposed to be the same game. During the development of Sonic CD it turned out to be a completely different game, but they were all supposed to be released at the sametime. Due to the game change the release time got delayed. Maybe its the link or maybe not. Also if your wondering why enemie
s from different zones drop different flowers its because they were gonna make the game like that. Sonic CD 510 still has this in the gameplay given its the earliest Sonic CD Beta. All Clips were taken from the PC Version

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