If you think she only did it for the money, you haven't even 'scratched the surface'. [=there are many other factors, reasons, etc., involved]
Despite the 'surface' differences between the two candidates, they are very similar in most ways.
The tension between them is beginning to 'rise to the surface'. [=it is becoming easy to see]
(..) I was a lab rat for their social experiment. They were trying to prove that women were shallow and can't see beyond the surface. And they wanted to get laid. Yes. That, too. Good times. So you slept (..)2011 TvShow: Suits Title: Rules of the Game Season: 1 Episode 11