AN MD-80 FLT CREW DEVIATED FROM THEIR CLEARED SID ROUTING WHEN THEY MISSED THE REVISED SEGMENT PDC.

Narrative

SEVERAL INTERRUPTIONS DURING PREFLT COCKPIT SET-UP. FMS PROGRAMMED WITH FLT PLAN DEP CEOLA4. RECEIVED CLRNC AND DID NOT SEE REVISED SEGMENT WITH CHANGE TO SLOTT2. THE CAPT AND I CHKED RTE AND LEGS AGAINST FLT PLAN AND SID PAGE AND LOOKED AT ACARS PRINTOUT OF CLRNC BUT DID NOT DETECT THE REVISION. UPON CLBOUT; DEP CTL ASKED WHAT DEP WE WERE FLYING. AGAIN; CAPT CHKED OUR CLRNC AND TOLD CTLR CEOLA4. CTLR HANDED US OFF TO CTR WITHOUT CORRECTION OR COMMENT AND THEN CTR QUERIED US. AGAIN CAPT CHKED CLRNC AND FMS AND TOLD CTLR WE WERE ON CEOLA4. CTLR ASKED IF WE WOULD ACCEPT RERTE DIRECT TCC J76 FTI THEN FILED RTE. WE ACCEPTED AND THE CTLR APOLOGIZED FOR THE CONFUSION. AFTER BEING HANDED OFF TO THE NEXT SECTOR WE REALIZED OUR MISTAKE OF OVERLOOKING THE REVISED SEGMENT. I SHOULD HAVE CAUGHT THE CHANGE AND AM UNSURE HOW I OVERLOOKED IT AT LEAST 2 TIMES. PERHAPS A REQUIRED ACARS ACKNOWLEDGEMENT; RADIO CALL TO CLRNC DELIVERY FOR ENTIRE RTE VERIFICATION OR NEW CLRNC WITH DIFFERENT SQUAWK CODE WOULD BE HELPFUL.