Speaking of getting stuck, it looks like there are still some areas where collision isn't the best. Like this area in HCZ1, I can occasionally get wedged into the wall at this quarter pipe when rolling at maximum speed. There always seems to be problems with them in Sonic games. If you push right you'll be glitched out of the wall, but pushing left will get you stuck. All you can do is get a time over or reset, assuming you're not using codes.