There have been no significant easter egg discoveries made on this track :(
Side note: While not an easter egg, it is possible to dump the bombs out of the cart, allowing you to freely blast through the track. To do this, simply drive up the first incline, then reverse back down the ramp. The cart should veer off to the left or right of the track and tip over. When it does, slow down, then reverse very slowly so that the bombs smoothly roll out onto the track.
Perfecting the technique is incredibly challenging. You need to be extremely gentle when tipping the cart over, as the slightest tap can detonate the explosives. However, the payoff for doing so is monumental, as you can easily improve your high score by 50-100 meters.