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.
Fridge Horror: Something that comes across as quite poignant is when you realise Morhange has forgotten all about Mathieu, the person who arguably turned his life around for the better and helped him get where he was today.
Memetic Mutation: the first few words of the main song, due to their catchiness.