Rainbow Road Shortcut
The Mario Kart sequence is stuffed with references. We see Mario drift around corners. We see a ricocheting Green Shell. We see a Blue Shell attack and subsequent explosion. We see a kart customization menu that looks exactly like the one in Mario Kart 8. But the coolest reference has to be when Mario is on Rainbow Road, and he drops down to a lower part of the track, a famous shortcut in the Rainbow Road track in Mario Kart 64
