In Sonic Mega Collection, there is a trailer for this game. The trailer features a song that is not used in the final game, and it's unknown what the song would have been used for.
Contributed by SonicManEXE
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Cream's concept art shows that she was going to be a fox who looked very similar to Tails. In the second design, she appeared to be a squirrel with many tails.
Contributed by Funland47