SONIC text is no longer backwards when the Tornado flies left during the ending.
I like to think of this as "Fix Tails' obsessive compulsion with painting the Tornado symmetrically."
However, I'm not too fond of:
Super/Hyper must be invoked by pressing B+C for a double jump (Megamix style).
...Just because it's not intuitive at all, with all the main Sonic games using just one button for everything, and all. =\
Indeed, it's a shame to lose the simplicity, and short of giving the game away in the manual, it'd be nigh on impossible to find the transformations at all if it had been set up this way originally. But ultimately I couldn't think of a better solution to the enforced transformation problem, which was one of my biggest problems with the original, personally. Triple jump is an elegant idea for Sonic, but Tails relies on that anyway for flight, and I also wanted to make sure I didn't make impossible any manoeuvres that you could do in S3K - which includes jump-super-glide, jump-super-fly, jump-hyper-dash.
It's probably a bit of a pain if you usually jump with A though. I might look at making it anything-plus-B sometime. I've used C for a long time due to debug.
EDIT: After having played it for some time, I gotta ask about the reason behind this:
Music no longer fades out before the Got Through screen
Having the "got through" music interrupt the level tune sounds a bit... odd.
Simply to imitate pure Sonic 3, which had no fade. I always preferred it that way, and after all Sonic 1-2 got away with it.
I'm not sure whether this comes down to my having been stuck with the PAL version for years - with the fade there combined with lower speed, it seemed like we almost dropped to eerie silence before coming back with a jaunty victory theme. This isn't nearly so jarring at NTSC speed, but I still prefer the lack of fade.
I did add it back in a couple of places where no fade sounded especially wrong - specifically where we go straight from boss music to victory music. That used to be Launch Base, Lava Reef and Sky Sanctuary, but now Sky Sanctuary is the only one left that works that way.