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.
YMMV: Pitch Black
Alternative Character Interpretation: There is a much-debated alternative character interpretation of Riddick in the scene of Carolyn Fry's death. The standard interpretation is that Fry went back to save Riddick, and then suddenly gets stabbed by one of the aliens, who then drags her off to her doom. The other interpretation is that it was in fact Riddick who stabbed her, sacrificing her to save himself. The alien then detected her wound (they go off on blood), and drags her off to her doom. Supporting this particular viewing is Riddick's look of sheer remorse on his face after Fry gets stabbed, the fact that he's a hardcore survivalist who's clearly in panic at the time, and Riddick moving his knife just towards the middle of Fry's back just before she gets impaled.Word of God is unhelpful on this. No comment is made in the DVD Commentary about it, and both the script by David Twohy and Jim & Ken Wheat and the novelization by Frank Lauria support both interpretations.
Or a third one that tapdances between the two ideas - that Riddick's blood was attracting the creature, and he intentionally moved so that Fry was the one that got grabbed by it - but it was likely an instinctual tactic, as he does suffer a minor Heroic BSOD immediately afterward.
Also, Riddick's comment at the end of the movie - "Tell them Riddick's dead. He died somewhere on that planet." This could be his way of saying he plans to start with a clean slate, or (as mentioned on the Tear Jerker page) that the last of his humanity had gone bye-bye.
Genius Bonus: In Pitch Black, Riddick-o-vision is in anaglyph 3d. Go get those red/blue 3d glasses. It's simply purple and blurred at the edges in all the other installments of the franchise, though.
I Am Not Shazam: The flying alien monsters in Pitch Black are never named throughout the course of the film. Sorry, "bio-raptor" and "demon" are just fanspeak.
Moral Event Horizon: Johns has two available in Pitch Black, although which one is the true event horizon is up for debate. The first is when he steals the morphine from the crashed spaceship - he's a junkie - so Fry's friend has to die in screaming agony. The second is when he suggests Riddick kill Jack and drag her behind to put the creatures off them - he offers to keep the others off Riddick's back in exchange.