Like I mention in the reverse completion thread, Red-hot ride. Very difficult to perform on a console but maybe not extremly.
http://dehacked.2y.net/microstorage.php/info/483684886/redhotride-craziness.smv - Here's a movie of getting past the sign, use Snes9x 1.43 V9 and up (Can be located at tasvideos.org).
Also, you forgot the easiest one: Topsail trouble but that one is boring because you can't get anywhere after the sign. (oops, you did mention it, my mistake
)
I'll think of some other where you can get past the sign...
Edit:
Oh yeah... Rattle Battle, first go past the sign, go back with diddy and dixie to the last bonus, wait for the kremling, bounce off him to get to the bonus with a teamthrow and get the snake, go to the end, get hit by the canonguy, wait with the screen placed a bit away (not too far) from the sign and try to wait till the snake has got past it and hey presto, he's past the sign. Can look pretty funny when diddy is holding on to the pole when making a high jump on the target.
And about level like Barrel Bayou, when you got Rambi by the goal target, try to "butt" (is that the correct word?) while the very right edge of the target while moving left, if you did it right. You will move slowly to the left instead of completing the stage until you get to the moving barrel, it's quite funny. Try it out.
Just discovered another one:
Hornet Hole, this one's quite hard to get it right. Alright, bring the spider to the end but don't kill the bee and then you'll have to line up two webs and the left side of the gap that you can walk across without falling over and they must reach so when you get hit by the bee it will land on the web, I think you get the idea. Then you went about by the hook and hurry to get the spider before he runs back again. If you want to get to the goal target, try to get some height to avoid the sign.
Web woods is possible, just walk on webs just barely under the edge of the ground and you will go under it.
Bramble Scramble - First parrot sign is also possible, just fly by the ceiling and make your way slowly forward, expect to lose one character.
I'm gonna check further
Castle Crush is probably possible but that's difficult, you'll have to crash the whole game and you're not really riding Rambi anymore
I've checked through the game now, some other stuff:
In Animal Antics you can get past the
Squawks barrel, but it's quite difficult to finish the area with the spider. Now I want to get
Squawks past the snake barrel, then it would be possible to get past the sign.
Screech's sprint - it's possible to go back to the beginning with
Squawks. Grab the
Squawks barrel before the middle barrel, break the middle barrel, die, enter the stage and you'll start with
Squawks and can go back.
In the same level you can also skip the race, just fly above the bird by the ceiling and you won't trigger the race. Awesome stuff.
That's all from me. Ask if there's something you wonder.
// Arne