A B737-200 WAS DISPATCHED WITH THE R WING FUELING PANEL DOOR NOT CLOSED AND LOCKED. LEADING EDGE WARNING INFLT AND DAMAGE TO SLAT AND FUELING PANEL DOOR WAS INCURRED.

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ON FRIDAY'S FLT ABC WE WERE WAITING IN ZZZ FOR A FUEL TRUCK. WE WERE INFORMED THAT OUR NORMAL VENDOR HAD RETURNED TO REFILL THE TRUCK AND WOULD BE LATE. THE NEXT MESSAGE WAS THAT THE TRUCK HAD BROKEN DOWN RETURNING TO THE ARPT. A SECOND VENDOR WAS CALLED AND SENT TO THE AIRPLANE. IT HOOKED UP BUT WAS UNABLE TO PUMP FUEL. THE TRUCK DISCONNECTED AND LEFT. THE FUELING PROCESS WAS BEING MONITORED BY OUR GND HANDLER/MECH. MY FO AND I WERE BUSY COLLECTING WX AND LOOKING AT ALTERNATIVES FROM THE COCKPIT. THE WX IN THE AREA WAS MARGINAL AND DETERIORATING WITH BLOWING SNOW. OUR DEST; ZZZ1 WAS IFR. ZZZ2 WAS VFR WITH A GOOD FORECAST. WE DID NOT HAVE SUFFICIENT FUEL FOR ZZZ1 SO A DECISION WAS MADE TO RERTE THE FLT THROUGH ZZZ2 FOR FUEL. WE ACCOMPLISHED NORMAL PRE-START PROCS AND OUR GND MARSHALLER GAVE US THE CLRED FOR START SIGNAL. THIS INDICATED THAT THE AREA WAS CLR AND AN EXTERNAL WALKAROUND HAD BEEN COMPLETED. AFTER TKOF WE HAD A COCKPIT INDICATION THAT SOME OF THE SLATS HAD FULLY RETRACTED. WE CYCLED THE FLAPS AND THEY EXTENDED NORMALLY. UPON RETRACTION WE HAD THE SAME INDICATION. THE AIRPLANE HAD NO ROLL AND AN EXTERNAL VIEW OF THE SLATS INDICATED THEY WERE UP. THE WX AT OUR DEP WAS QUESTIONABLE FOR A NON PRECISION APCH; SO WE ELECTED TO CONTINUE TO ZZZ2. THE APCH AND LNDG IN ZZZ2 WAS NORMAL AND ON FLAP RETRACTION TAXIING IN THE SLAT INDICATION CLRED ITSELF. A POSTFLT INSPECTION DID NOT REVEAL ANY ABNORMALITIES. THE AIRPLANE WAS FUELED AND WE DEPARTED FOR ZZZ1. THE FLT WAS ROUTINE AND WE DID NOT EXPERIENCE ANY FAULTS WITH THE FLAP/SLAT SYS. AFTER SHUTDOWN I MADE A MAINT LOG ENTRY ADVISING THAT WE HAD AN INDICATION PROB WITH THE SLATS THAT HAD CLRED ITSELF. IT WAS INTENDED AS AN ADVISORY THAT THE SYS WAS NOW PERFORMING NORMALLY BUT IT SHOULD BE MONITORED. OVER THE NEXT FEW DAYS I LEARNED THAT THE FUEL DOOR AND AFFECTED SLATS WERE DAMAGED. THE DAMAGE WAS NOT READILY VISIBLE FROM THE GND WITH THE SLATS RETRACTED. WE WERE LATER TOLD THAT THE UNLATCHED DOOR WAS MENTIONED TO A MECH BY THE FUELER. THE DOOR WAS CLOSED AND LATCHED SO THE MECH LET IT GO. THIS WAS NOT COMMUNICATED TO THE CREW. WE ALL KNOW THAT MISTAKES HAPPEN AND WE HAVE SAFETY PROCESSES TO CORRECT THEM. THE DOOR WAS OVERLOOKED AND CAN BE CORRECTED SO THAT IT DOES NOT HAPPEN AGAIN. WHEN IT WAS DISCOVERED BY THE GND CREW IN ZZZ2 THAT THE FUEL DOOR DID NOT APPEAR TO BE NORMAL; IT SHOULD HAVE BEEN COMMUNICATED TO THE FLT CREW BEFORE DEP. CRM RELIES ON OPEN COM BTWN ALL PERSONNEL INVOLVED IN THE PROCESS. WE MUST MAKE CERTAIN THAT OUR GND CREWS ARE AWARE THEY ARE A KEY PIECE IN THIS CHAIN AND MUST RPT ANY DAMAGE OR SUSPECTED DAMAGE TO THE FLT CREW FOR FURTHER EVALUATION.