EMB 190 FLT CREW DEPARTING HOU MISSES REVISED SID ON PDC AND CANNOT INITIALLY COMPLY WITH ATC INSTRUCTION TO PROCEED DIRECT DARTR.

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WE WERE CLBING OUT AFTER TAKE-OFF FROM HOU ON RADAR VECTORS HDG 350 DEGS WHEN APCH INSTRUCTED US TO PROCEED DIRECT DARTR AND CONTINUE AS FILED ON OUR FLT PLAN. WE RESPONDED THAT DARTR WAS NOT ON OUR CLRNC OR FLT PLAN. DEP INSTRUCTED US TO MAINTAIN HDG 010 DEGS AND CLB TO FL230 AS WE SORTED OUT THE DISCREPANCY. DEP ASKED US IF WE HAD EL DORADO (ELD) ON OUR CLRNC WHICH WE RESPONDED WE WERE EXECUTING THE LUFKIN 5 DEP OUT OF HOU PER OUR PDC BUT AFTER CLOSER EXAMINATION OF THE PDC THE CAPT AND I REALIZED THAT THE PDC DID CONTAIN THE ELD1.ELD SID. WE QUICKLY LOADED THE ELD 1 DEP INTO THE FMS AND TOLD DEP THAT WE COULD PROCEED TO DARTR AND COMPLY WITH THE SID. DEPARTURE INSTRUCTED US TO PROCEED TO ELD THEN CONTINUE WITH OUR FLT PLANNED RTE AS FILED WHICH TERMINATED IN AN UNEVENTFUL LNDG. CENTER REQUESTED THAT WE CONTACT HOUSTON CENTER UPON ARR SO WE COULD DISCUSS THE CONFUSION WITH THE SID. CLOSE EXAMINATION OF THE PDC RECEIVED FROM HOU CLRNC DELIVERY REVEALED THE FOLLOWING: 'PDC: ATC CLRNC: ELD1 ELD THEN AS FILED. FILED FLT PLAN: HOU LFK5 LFK LURIC/ZZZ. SQUAWK! THE CAPT AND MYSELF HAD READ THE PDC TO BE THE LFK5 AS FILED WHEN LOADING AND CHKING THE FMS ON PRE-FLT PRIOR TO PUSH BACK FROM THE GATE WHICH RESULTED IN OUR QUESTIONING THE ROUTING WHEN ASKED TO PROCEED DIRECT TO DARTR THEN AS FILED. OUR LEARNING RESPONSE FROM THIS EVENT IS TO ENSURE CAREFUL EXAMINATION OF PDCS TO PREVENT CONFUSION IN THE FUTURE BUT WE WOULD ALSO RECOMMEND THAT THE PDC BE FORMATTED TO REFLECT THE DELETION OF THE APPROPRIATE PORTION OF THE FILED FLT PLAN 'FILED FLT PLAN: ELD J29.' THIS SHOULD HELP PREVENT FUTURE CREWS FROM MAKING THE SAME MISTAKE THAT WE DID TODAY.