A friend I'm watching this with pointed out that the lady who got isekai'd with the train is actually a reference to an old 2chan creepypasta post! It's neat that they're bringing in modern folktales in addition to older ones.
A nearly-forgotten subplot of people disappearing rears its head, and ugliness from our own world breaks the chill atmosphere of tonari-no-yokai-world.
A little scifi mumbo jumbo, buttons on opaque machines pressed, and things are back to normal(?)
Just to make us better appreciate the social balance that the folks in this show's world have?