The Whirlygig & Dizzy Heights shortcut (?)
The Whirlygig has 3 ways to goal, but the middle way is the hardest due to propeller. The tip is, 'Do jump dive before you reach the top of the conveyer'. The conveyer will bring you to the top automatically and you'll be safe from the propeller. You see the pink guy and wolf guy knocked out by the propeller, but I reached safely.
Dizzy Heights' ball area. You don't need to hide behind the box when the ball comes. You can dodge the ball via jump dive and go faster than others.