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.
The Scrappy: Trinity, as seen (or not) in Shinbok. His entire task is to follow Django around, inadvertently causing chaos as he goes, and forcing the player to bail him out. Needless to say, he is pretty much universally reviled within the fandom.
The Untwist: The original game doesn't end after killing the Count. Given how early in the game the fight is, that's no surprise.
Waggle: If you live in a basement or something you're going to have to waste a lot of time setting up lamps in order to play the game properly. Even then, you may want to apply sunscreen. Lots of sunscreen.
ROMs for computer emulators get around the distinct lack of a sunlight sensor (or the inability of your average computer to go out in the sun on a reliable basis) by being modified with a script that allows you to manually choose how much sunlight the game thinks it's nonexistant sensor is getting. This sadly breaks both the Sun Bank and the Astro lens, though.