Just submitted a couple live videos.
RC - The break OoB with Amy works the same way in GP, TA, and RV. You just wiggle in the corner of the starting gate and track and hit the boost. Eventually you break through but it doesn't always happen right away or on the first try. You can see how this works in my 20"60 with Amy.
RF - The break OoB with Amy & Super Sonic works the same way in GP, TA, and RV. You just wiggle in the corner of that area and eventually you just walk right through. You can see how this works in my 24"63 with Amy. What you can't see in my replay of my 19"60 with Super Sonic is that I just walk through the wall leading up to the normal break OoB spot. This is the wall I am boosting against with Amy in my 24"63. It doesn't happen very often which is one of the frustrating parts of this game.
RR - The break OoB with Super Sonic works the same way in GP, TA, and RV. Just a matter of timing the double jump and angle in which you approach the track. My live 26"53 better demonstrates how this works as opposed to my 25"83 replay.
RI works just like RF, wiggle between the rock and fence near the start and eventually you walk through.
RE GP & TA 3laps work just like RC. You wiggle in front of the gate to the right and hit the boost to break out. Only downside is that you have to break OoB 3 times (once per lap) so to do it quickly means insane luck. The RV 3lap and flaps here are special cases and those are probably better seen than read.
I've discovered a ton of new ways to break OoB with other characters which is why I beat my RR flaps tonight.
So yea, more videos on the way! xp