These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Porting Disaster: The N64 and PS1 versions are... not good. Levels were missing tons of obstacles (the sliding door in Supermarket 2, the train on the toy level), there were missing graphical effects, the framerate was a slideshow, and worst of all, there could only be four racers (the Dreamcast version had at least 8, and the PC version can go to 12). Also, if there was even one other racer or the slightest graphical effect on-screen, you got catastrophic slowdown. Nothing quite like getting to the sequence at the end of the championship and having the game slow to 1/3 speed whenever a firework goes off. Needless to say, the PS1 and N64 versions were pretty much unplayable.