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: In certain emulators, a glitch involving resetting the game allows you to initialize all high scores to zero. Perfect if you keep track of your scores, because the lowest default high score of 1.2 million can take weeks of practice to attain. There is also a bug with the true final boss that has your end of stage invincibility not wearing off until you bomb. Most players won't realize it due to bombing on reflex.
Scrappy Mechanic: This game never shows your total score during gameplay; it's only shown at the end of each stage, as well as after getting a high score and ending your game, which wouldn't be as big of a problem if the lowest default high score wasn't difficult to obtain for new players. This caused a huge problem at a shmup tournament where many players who couldn't get on the high score table either manually calculated their scores by hand or simply didn't bother to submit scores.