Ending off-road mushroom shortcut
Go out wide, release a mini-turbo and feather over the ending shortcut. Do not go tight over the signs or Lakitu picks you up.
Double tree shortcut
Trick left before the end of the rail, land low on the wall, trick right at the dark line toward the first tree, then steer between trees with mid-air corrections; very risky, skips an item box, and not recommended often.
Snowball-corner wall-ride skip
After the first item set, take the turn wide, release the mini-turbo on the red-and-white strip, charge jump straight onto the wall, wall ride up, trick off into the snow between the dead tree and the signs, then wall ride back onto the road - much faster than going around and 100% consistent once the wall angle is learned.
Pole auto-trick at the start
Right at the beginning, skip the crazy sharp turn by tricking off the end of the curb and then tricking off the pole to land on the other side. The creator calls it fairly simple.

