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.
YMMV: Haunted Castle
Big Lipped Alligator Moment: During the third stage, you're suddenly warped to an alternate dimension where you must kill three Harpies. This never happens again, nor is it ever explained.
Breather Boss: Frankenstein's Monster, the boss of the penultimate stage, is perhaps the easiest boss in the whole game.