I found a few plane glitches a while ago, but wasn't able to record them.
Went to ESA this year and a friend had a capture card for 3DS, so I was able to get some nice quality videos. Unfortunatly one file got corrupted and was only able to upload 3 out of 4.
Space Dust Valley
Please read the description for a detailed explaination.
So I was messing around on Storm Creek trying to land closer to the finish line than the current strat does and I stumbled upon this:
When you go from wrong phase to correct phase while not pressing A or B on a jumpplate (while going forward? I can't replicate it in slowmo), you don't get any forward momentum from the jumpplate untill you press a button. We can abuse this to land closer to the finish line instead of landing all the way in the back.
Now I'm not entirely sure how this exactly works yet and if you need to touch the rails or anything, but this is very useful on this track and potentially others, as you now don't have to make weird zig zag pattern jumps (Turbine Canyon) to get near the landing area you want to go.
Trick in action: