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.
A more literal version of this trope was the Sega CD port, which featured a smaller display, grainy graphics with muted or greyed out colors, and a slightly reduced FPS.
That One Level: The battle with the Lizard King; fifteen seconds of waiting followed by five seconds of split-second button inputs. Dirk's badass reaction to clearing the room is worth the pain, though.
Well, Lizard King becomes a ton easier to beat when you play it on the DVD player port. On the other hand... the electric floor stage becomes a ton harder. Especially if you play it on the real hardware.
When taking the NES version into account... The whole thing can count!
Foe Yay/No Yay: Near the end of Level 6, when Dirk unwraps the "mummy", believing it to be Daphne, he finds that "she" has Mordroc's head before morphing back to the wizard himself, who gives him a kiss on the cheek before Dirk pushes him off. This is pretty Squicky and a bit of Fan Disservice.
Hilarious in Hindsight: As Ludwig van Beethoven's Symphony No. 5 plays entirely in the background of Level 5, you have to fight off a fire-breathing cat while going through the skies of light and darkness during his creative gust and collecting treasures, one of them a "golden butterfly". Nine years later, there's Fantasia 2000, where Symphony No. 5 does indeed play, and though there are no people or musical instruments, there are indeed objects that are shaped like butterflies (though not golden) and bats as they fly through skies of light and darkness, with the latter ultimately conquered by light.
Mordroc placing the Death Ring on Daphne in the opening movie. When it happens in the game, we're looking at Dirk's POV so we can't see it too well, but the version seen in the opening is up close through Daphne's POV, showing her and hand gruesomely transforming and having her make a terrified, painful scream, highlighting the Transformation Trauma and Body Horror she goes through.
Special Effect Failure: At the beginning of Level 5, when a few objects flash upon being triggered by each button press, no "flash" sound is emitted; and it continues in this way until you fall into the skein and Mordroc shouts out, "Princess Daphne is MINE, YOU FOOL!"