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.
Polished Port: The 3DS version of the game is aiming to be this, with this blog post explaining how everything is being reworked to accommodate the new system.
Unwinnable by Insanity: In stage 2 of Final Castle, it's possible to trap yourself by killing the entire Bomb Squad and using up all of your bazooka shots. With nothing to blow up the walls and nothing to kill you, your only option is to save your game and start the whole stage over again.