-The Other World is at the bottom of the well. The well and the portal behind the little door are extremely similar in appearance.
-The Beldam is a witch who made herself immortal by using children’s souls. She was there probably before the town was founded. The reason she has a spider motif is because she acts like one, creating a web to attract and trap her prey. Her monster form is the result of her overuse of black magic, she’s not human anymore.
-The Cat lived at the same time as the Beldam, and tried to save the ghost kids like he did with Coraline. They’re both connected to the Other World, which is why he can travel there.
-The key is basically the Beldam’s magic wand. It ties the real world and the Other World together. That’s why there’s only one.
-The Beldam made dolls as a hobby or for a living, before she began stealing souls. This is why everyone in her world has button eyes, they’re all just living dolls she’s created. It’s also why her true form looks like a spider made out of sewing needles, and why she can only copy things in the real world. Sewing buttons onto a child’s eyes is making them another of her dolls, her property.
-The reason the Other Father and Other Wybie rebel is because they’re simply following their orders. The Other Father was made to love Coraline, and the Other Wybie to be her friend. The Other neighbors were made just to entertain her, not care about her.