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.
Good Bad Bugs: Ranged weapons and spells can be used on enemies on the other side of certain types of walls and doors (such as prison-style bars), but they can't attack you in return. This is eliminated if you install any of the patches for the PC version.
The unpatched PC version also has a truly remarkable way to use the very limited inventory space to generate unlimited gold for your character. Explicit directions can be found on a number of fan sites.
Nightmare Fuel: Be prepared for a cutscene following the fourth dungeon in which the landscape drastically changes.
There's also the Village of the Damned, where you can be mauled to death by an entire screen full of poisonous spiders. It takes only seconds.