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.
Also, this: "Missing Grandfather" For a series that tends to be dark and depressing, this is one that comes off as both funny and sweet.
Fridge Logic: Basically applies it to many works and situations.
For a straight example, Miggs. The guy who popped out of the cake shot everyone in the room. If he'd been in the correct cake, wouldn't he have killed the two conspirators as well as the intended victim?
Weeaboo◊ as a term for an Occidental Otaku, though that's not the context it was used in the strip at all. In the strip, it was simply a word of no decipherable meaning. A 4chan admin that was a fan of the strip made a word filter change the then more common term "wapanese" into weeaboo as a joke, and it spread from there.