Castle: Ultra: Drive forward until you approach the house with the red banner. Turn right instead of left and drive close to the wall near or through the gap in the wall and reset the car. Tiny: You can fly to the finish line by driving on the right side of the right pillar of the last bridge. You need to touch it with the left side of your kart. This is just a small time save, but it's pretty consistent.

Island: Small: You can drive over the brown stone in front of the sharpest turn. Small: You can take the turn before the long bridge tighter by driving on the right side of the side rail.