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]
(..) Are we still friends? I mean, if you're still Kyle's girlfriend then yeah, I guess I'll see you around. Mortar rounds fired at the camp that would fly over them if they are down below the surface of the grounds, and that is hard work, believe me, if we had to do it our- I'm ready. What? Oh, okay. (..)2017 Lady Bird