We'll be getting more Cora backstory. For one thing, Regina's Daddy we've seen before seems awfully short to match up with the long drink of water we saw last night.
More importantly, Cora somehow mislays a kingdom between this story and the time Regina saved Snow White from a runaway horse. You'd think there'd be a story in that.
Although, a one-liner about absentmindedness would be refreshingly brief?