The end panel was slightly changed graphically in the final game from the 510 version. Sonic seems much chirpier in the original, while the final gives him a frown on his face.

The Super monitor from Sonic 1's debug end panel returned as an item for Sonic CD 510, along with two new items, the Blue ring and the Timer. Both the Super and Blue ring monitors give you a temporary 'Super' Sonic, where Sonic gets power sneakers and invincibilty at the same time. The Timer does not fully work, but it's purpose it obvious. It would have stopped time for a breif period, but all it does in the prototype is stop the rings from spinning temporarily. Whether it was planned to affect the time counter as well [:. Making the Time Attack mode easier] or just stop the badniks breifly isn't known.

Amy's sprite was also changed for the final version of the game. In Sonic CD 510 her eyes are much smaller, and less Sonic-cy. Her quills were shortened, and her puff of hair was changed slightly.

In any screenshot of Sonic CD 510 on this website, you'll notice that the number for the lives is off center. This is later fixed in the final.