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
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