That SEGA stage [Expert 22] was quite the pacebreaker for me when I didn't have a memorized strategy on how to deal with it, since I think I always lost the run on that stage whenever I played the Gamecube version. Because you have to go over the SEGA logo, which has a lot of gaps, you need to approach the gaps from both the right position [you need to run into the straight areas of the terrain after - trying to run into corners didn't work] and the right speed to make the jump in the first place. Get that right like...four or five times until you get to the goal. It's kinda hilarious that Stage 23 and Stage 24 are far easier to figure out blind than Stage 22 though [23 is going through a wavy yet doable path, and 24 is just going through a long road with many turns...but it isn't as tight as Expert 7 so you can deal with it fairly easily if confident enough].
Expert 49 gave me a surprise achievement as the third attempt I took at it was VERY lucky...because I went straight into the goal - the achievement in question being beating the stage without touching a bumper. Note that the goal is spinning with other bumpers spinning around it, so it was quite the luck to run into it at the perfect timing.