When spinning, Mario can cancel the spin by crouching. This can be followed by a long jump. If performed correctly and optimally, you should never seen the spin but the game still considers Mario to have spun. This can activate the reversible panels in Flip-Swap and other galaxies that feature them.
In addition, you can also perform a spin after the long jump. This means you can get the full distance possible between two panels of the same color. Just perform the spinning long jump, then spin whenever you need to.
I did not discover this trick and I am not taking credit for it. If any of this is wrong, please correct it (by messaging me on Discord).
I also will try to make a video and attach it to this post later.
Hey SMG2 runners! After testing/confirming that Evanbowl's restart mod does not affect cycles or the in-game timer (thank you Shadow64), we're happy to announce that it will be allowed for single star runs ONLY. This will not be allowed for world RTA, all stars, normal stars, or green star runs. Add