Doubles as Fridge Brilliance- Shy Guys are so shy they don't even show their faces, let alone work up the courage to speak. The act of winning makes them so happy that they actually say something!
The sight of some of these retro tracks not only being imported into a new Mario Kart game, but getting an unprecedented graphics overhaul to the point where they look totally brand new when paired up at their less graphically advanced original designs. Some veteran fans may have imagined these tracks with better visuals, but to take it the extra mile and throw in Scenery Porn that was not even in the original shows the game designers truly pulled out the stops on this one.
Koopa Troopas are guiding the trolleys in Toad Harbor. It's really cute seeing how normally enemy Koopas giving cheerful Toads a ride around the bay.
Koopa Troopas and Shy Guys dancing together in Electrodrome
The general sense of togetherness and happiness that the game portrays with the cooperative and pack mentality friendly collision boost mechanics of the zero gravity sections and the celebratory and party atmosphere that's prevalent in a lot of the tracks is very heartwarming indeed. It's as if the game is a gigantic party celebrating Mario Kart's history and future in-universe.