First of all, there is a torii in Japan, but generally speaking, torii put this stone statue in the middle, but not in Spirited Away, but beside it, which actually implies that Chihiro's parents have entered an unusual place.
When I arrived at this place, there was no one at dusk. There is another saying in Japan that at dusk, ghosts began to travel. At this time, people may or may not come across from you, but it was dusk, and there was no one in the village and there was no delicious food. This may be really strange.
Simple children are in awe. Chihiro is very scared here, but her parents don't think so. In the face of temptation, her parents didn't resist. Instead, they just asked a few words and began to eat like crazy. They slowly lose control and become fatter and fatter, which describes the greed of human nature. When they get something beautiful, they don't want to stop.
Later, when Chihiro called his parents, his parents turned back into two pigs with confused eyes. At this time, they don't even know who Chihiro is.
What I see from this point is that many times when adults enter the real world, they are no longer like themselves, they don't even know who they are, and children won't change, because their minds are simple, so they can resist temptation.