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: Narue No Sekai
Ear Worm: The OP for the anime, Nagareboshi/Shooting Star by Coorie, is very catchy.
Woolseyism: In episode 2 in the dub, the audio of the movie Kazuto and Narue are watching seems to have an Arnold Schwarzenegger expy.