Sonic's graphic on the title screen of Sonic the Hedgehog has a belly that is obscured by the logo's ribbon. This is a leftover of the animatic of Sonic's appearance on the title screen. On earlier, less accurate emulators, including Sega's own emulator made for Sega Smash Pack Volume 1 on Dreamcast, a common error would involve Sonic's belly hanging over the ribbon.

Within the game is a text file named ECHELON.TXT, calling out the warez group of the same name. The file basically explains how to create a ROM loader using the emulator the game uses. This is particularly perplexing as the game was released the same day Sega announced they were to pull out of the console market. Gary Lake, who left these instructions, was the programmer of the game. He is now the Director of Technology at Capcom.