A B737 FLT CREW FLEW AN INCORRECT SID OUT OF LAX WHEN THEY MISSED THE CHANGES IN THE PDC.

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ON JUL/08; I WAS THE CAPT FLYING ACR X FLT FROM LAX TO ZZZ. I WAS THE PLT MONITORING ON THIS LEG. OUR DISPATCH FILED OUR FLT PLAN VIA THE FOLLOWING RTE: LAX-LOOP4.DAG.KEPEC2.ZZZ. WHEN THE FO ACQUIRED THE CLRNC DURING HIS NORMAL PREFLT DUTIES USING THE COMPUTERIZED PDC METHOD; HE MISSED THE AMENDED RTE LOCATED BELOW THE ORIGINAL FILED RTE IN THE ACARS MESSAGE PDC. PDC CLRNCS ARE RELATIVELY NEW TO ACR AND UNFORTUNATELY ARE SOMETIMES CONFUSING AT TIMES. WHAT USED TO BE A SIMPLE TASK OF PICKING UP A CLRNC FROM ATC WHICH INCLUDED THE FLT NUMBER; CLRNC LIMIT; RTE; ALT ASSIGNED; DEP FREQ; AND SQUAWK CODE; NOW HAS THE FOLLOWING IN A PDC: FLT NUMBER; DEP CITY; ARR CITY; SQUAWK CODE; DEP CITY AGAIN; TYPE ACFT; EQUIP SUFFIX; PROPOSED DEP TIME; ALT FILED; RTE FILED; EXPECTED DEP CLRNC TIME; DEP ASSIGNED; AMENDED RTE; ALT ASSIGNED; DEP FREQ; AND PUSHBACK INSTRUCTIONS. NOT ONLY DOES ATC INCLUDE THE RTE FILED; BUT YOU HAVE TO SEARCH FOR THE AMENDED RTE IN THE PDC WHICH WILL BE HIGHLIGHTED WITH A +/-. ON THIS PARTICULAR FLT; THE FO UNINTENTIONALLY MISSED THE AMENDED CLRNC WHICH HAD A DIFFERENT DEP FOR EARLY MORNING DEPS FOR NOISE ABATEMENT WHICH CONSEQUENTLY CAUSED US TO PROGRAM OUR FMC INCORRECTLY AND FLY AN INCORRECT RTE. THERE WAS NO LOSS OF SEPARATION ACCORDING TO THE CTLR. THE MAJOR LESSON LEARNED IS THAT AS THE CAPT; I WILL ALWAYS VERIFY THAT THE PDC CLRNC REFLECTS THE SAME RTE AS THE FMC; AND PROVIDE MY FO WITH A BACKUP SCAN; THROUGH THE SOMETIMES LENGTHY PDC CLRNC; FOR ANY POSSIBLE REROUTES.