Based on standard extractions of this course, the zip file likely includes:

: Moles that pop out of the ground in the dirt/mud sections.

: Large, non-collidable walls that create a maze-like structure.

: In the Mario Kart 8 Deluxe version, the final lap typically reverses the course direction, a feature often discussed in competitive speedrun communities . DS Peach Gardens - Custom Mario Kart