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.
Anti-Climax Boss: The stage Grim Volcano features a (get this) ballet-dancing panda bear that's set up as some kind of big deal, since you're not on a boss stage and he gets his own introductory cutscene. His moves are unpredictable and almost erratic, and it may take you a while to figure out how to defend yourself from him, but once you manage to break his defenses, one or two good punches is all it takes for Donkey Kong to pound him into mush. The bear comes back in a later stage, Asteroid Belt, complete with the same introduction, but just as easy as before.