Board Thread:Spoilers!/@comment-24769579-20151117111725/@comment-26620090-20151117113126

Because we'll see a flashback with Eva and Hades in the Underworld when she sees Snow growing up with Leopold and Regina LOL just kidding.

I think that Snow learned something about Greek mythology or at least met someone connected to them when she was a teen,because that flashback will appear in "Labor of Love" :P