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.
Guide Dang It: There is absolutely nothing to indicate that there's anything after getting the Master Rank in GB. In fact, you have to throw Wondacoins into the fountain to trigger battles with three brothers, then fight Holly/Colt once more to unlock The Very Definitely Final Dungeon.
Nightmare Fuel: Some attack animations, and Colt being sucked into the plate at the beginning.
Some "Event!" cards cause scary music to play. Even worse if it's on the last few turns, where it speeds up.
Surprisingly Improved Sequel: the first game was released for the Gameboy, the second one for the PlayStation. Besides graphics and music, the game in general is smoother, and has a decent translation.