In "As I Lay Dying", there are moments scattered throughout the book that imply that there are some supernatural things going on. The one that's really obvious is how Darl just sort of... knows things. It's not clear how he knows these things, but he does. He knows that Dewey Dell is pregnant, he knows that Jewel is not Anse's son, he knows when Addie dies, and possibly weirdest of all, he can understand Vardaman. Actually, that's not really a supernatural ability, but Darl was able to understand and articulate to Vardaman what Addie was saying in the coffin before he burned the barn, if we take Darl's word that Addie was actually speaking. Also, there's the whole 'eyes full of the land' line, and how Darl regularly narrates events that he is not present for that implies that Darl might be an omniscient character.
Maybe this ability to know things is hereditary. Addie seems to have this way of knowing things too, like when she tells Cora that Jewel will save her from water and fire. How could she have possibly known that Jewel would pull her coffin out of the flooded river and out of the burning barn? Those things happen after she dies. Also, it seems odd that Jewel would save anyone from anything. He seems pretty self-centered throughout the book, so Addie was probably not making an educated guess based on Jewel's personality.
Speaking of the flood, even that seems a little supernatural. Sure, people were expecting rain, but it seems strange that there would be a massive flooding of the river just after Addie dies. Also, the wagon broke down. Possibly a coincidence, given that the Bundrens are poor and the wagon is not the most impressive. But considering all the obstacles and sacrifices made during the journey, I wonder just how much of it was Addie torturing Anse.
