Thanks for the explanation =) From now on I'll be starting a new movie each time I make another try.
The glitch is actually quite surprising and makes perfect sense. Super Sonic flag is something alright xD Too bad it doesn't do anything really useful for Tails.
While I was speedrunning I happened to find a lot of strange glitches in Sonic 3.
For example, if you do this glitch
https://youtu.be/rJrEpfby_yg?t=9m31s (shown in the video on the left, which is my run for the 1/8 of the tournament) in the wrong way, starting moving left while offscreen too early, you can either softlock the game, or the screen will go dark and either start the multiplayer music or there'll be the sound of counting the score, and the score will be so high it'll give you two one ups and a continue, and after the invisible score is done counting, you'll be loaded back into act 2 of MG, but the background will be all glitchy. I believe that this glitch is actually a screen of a perfectly completed special stage, that can get the same effect if you collect all the rings in it.
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There is a splitting passageway which leads to two almost identical and terrible routs. And thouse routes have that particular problem along them.
The highest we could get was 2574 and you need to be at 2572 to squeeze through that little gap in the ceiling.
During our attempts we came up with a few decent ways to gain speed using jumps and gliding only, but in these partivular places they've only got us that far.
So here we are, in need of help because thouse two pixels of height are almost the only obstacle in trying to make a successful arrowless walkthrough of S&K part.
We'll be very grategul to anyone who can help or at least give it a try. Thank you so much!