Here's something for a quick eye to spot!
In the racing section of the game Toy Commander, you race across the wooden floor and around obstacles. However, if you look closely, you'll see one of the jump ramps is clearly meant to be a magazine/magazine cover. The cover says "1999" and obviously has a picture of SA1 Sonic on it. Even though you can't see his face, his spikes, ears, arm, and hand are all clearly visible. This is an interesting old way to work a cameo in.