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]
(..) Thanks for asking. Would you just explain calmly? You don't know you won a trip to Fhloston for two for ten days? And you want me to freeze my ass off on the lunar surface? lf l'd won a trip, l'd know about it. They'd have notified me. They've been blaring your name on the radio! (..)1997 The Fifth Element