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.
Memetic Mutation: The track "Whoa I'm In Space Cuba" is quite popular among the YTPMV crowd, spawning videos such as this.
That One Level: Incident .14 in the sequel, to beat under par, requires memorization of the entire level beforehand, due to the elaborate puzzles involving the color blocks that don't switch if you stand on them. You have to keep track of which colors are in and which ones are out, because the solution to one puzzle might mess up the solution for the next puzzle.