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 lot of this comes from just how loyal it is to the rules of the series. Everything from how one becomes an Immortal, to The Buzz when they near another, to rules like holy ground being sacred and only one to a fight, are all strictly honored by the filmmakers. Not to mention the animated medium really showing just how far removed from mortals Immortals are for the very first time.