Sonic Generations - Hub World Out of Bounds Glitch/Skip

Unfortunately these skips seem to have no use as you can't get into any of the levels. Easiest way to test this is to use a mod which shows you the invisible walls (can't remember the name of it xD). On the second glitch you can land on the top of the wall on the left, but it's only 1 pixel thick so pretty tricky, and it has no use anyway.