Board Thread:General Discussion/@comment-26965399-20160928003947/@comment-25932613-20161008035650

The Eve thing was in a way foreshadowed through the oddity of her being the only demon that took a human vessel and the fact that her vessels took on the form of Eve Moonlit before she jumped into the Clockworker's Doll.

Besides that there may not have been much foreshadowing to Adam and Seth but also remember that we are an english audience looking into a series that has only been fan-translated and very easily could've missed foreshadowing that was present in the novels if you weren't in possession of the source material and could easily translate it.