If you transform into Super Sonic on City Escape Act 2 and run out of rings when being chased by the Semi-truck if you keep boosting even when you transform back to normal Sonic you will still have the golden boost aura!
You are able to play the very first version of Sonic the Hedgehog. To do this, purchase the SEGA controller from the shop at the left of Green Hill Zone. You then need to take it to the SEGA console found at the top left of Green Hill Zone and you will be able to play the original version.
To unlock the Statue Room, go to the Collection Room and place Sonic at the right of the Movie Chair but to the left of the Art painting. If you then hold down the Back button, Sonic will go through a trapdoor into the Statue Room.
In the Statue Room, you can get various statues using passwords.