Jerkass: Mori Hideki in "The Critic", who appears to enjoy tarnishing the eateries he reviews for the sake of it. He gets turned into a forever-hungry ghost in punishment.]
Offing the Offspring: The protagonist in "Yanari" accidentally kills her young son, mistaking him for one of the titular creatures.
Our Dragons Are Different: Here, they are Precursors, who dwelled in the universe before the current one, known as the Lloigor. They can reproduce with human women, producing offspring with varying attributes, depending on how diluted the dragon sperm is.
"Sea Beef" is a remarkably accurate portrayal of the Japanese whaling industry (e.g. whaling boats typically have a zoologist or marine biologist on board, to maintain the illusion of scientific respectability and that protected species are sometimes hunted)
"The Brides of Mizuchi" is a creepily accurate depiction of cult tactics. "Brides" also explains the reason why it's difficult to determine whether a cult is holding people against their will; quite often, the members have been brainwashed into believing they made the decision of their own free will.
"Moryo" contains an accurate depiction of freak shows. All the purported yokai in the protagonist's freak show are giant puppets, drugged animals or deformed humans.
In "Enryo's Last Case", a lot of the explainations of the phenomena the titular professor investigated are all common explainations for Japanese folkloric phenomena.