PARTY PANIC: ALL REWARDS AND FINAL CUP 2 PLAYERS 

You're Welcome Bro.

The devs said it's just an eager egg that nods to their name. Doesn't do anything

You have to jump with the car

With the square you bump the car so at the end of the ramp take a lead and bump to make a high backflip so you can then leave out with triangle

There ara different versions of the game. At some versions you can jump over buildings.