A B737 CREW FAILED TO SEE THE SECOND PDC PAGE WHICH INCLUDED A LAS SID REVISION; AND SO AFTER TAKEOFF TURNED THE WRONG DIRECTION. ATC GAVE IMMEDIATE VECTORS.

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DISPATCH RELEASE NOTED A NON STANDARD ROUTING TO DEN WITH THE TRALR DEP FILED IN THE SYS. PDC DISPLAYS THE TRALR AS WELL AS THE STAAV. THE STAAV WAS SUBMITTED AS A CHANGE TO OUR FILED ROUTING. NEITHER OF US CAUGHT THE CHANGE. THE TRALR WAS LOADED AND BRIEFED. CLBING TO OUR FIRST FIX ON THE DEP; WE WERE UNABLE TO IMMEDIATELY ESTABLISH RADIO CONTACT WITH DEP. WE HAD TO SWITCH FREQS FROM THE ORIGINAL DEP CTLR WHOM WE CHKED IN WITH. WHEN WE DID GET THE RIGHT DEP CTLR; WE HAD JUST BEGUN OUR L TURN ON THE TRALR. THE CTLR ISSUED US A R TURN TO FOLLOW THE STAAV'S GND TRACK. WE AT FIRST THOUGHT THE CTLR WAS DOING US A FAVOR WITH THE VECTORS; BECAUSE WE WOULD HAVE PREFERRED A NBOUND TURNOUT. INSTEAD WE DETERMINED THAT THE CTLR HAD INTENDED FOR US TO FLY THE STAAV DEP ALL THE WHILE. TWO VECTORS WERE GIVEN. THE STAAV WAS PLUGGED IN AND FLOWN WITHOUT PROBS. IN FACT OUR GND TRACK WAS MOST LIKELY RIGHT ON TRACK IN THAT WE CAUGHT THE ERROR JUST AS WE WERE STARTING TO MAKE THE FIRST TURN. DURING THE PREDEP BRIEFING INSTEAD OF JUST LOOKING AT THE RTE PAGE 2 I WILL NOW VERIFY THE RTE PAGE 2 AND THE ACARS PDC FOR LAST MIN CHANGES TO THE PLAN. SUPPLEMENTAL INFO FROM ACN 809832: WE RECEIVED A NON-STANDARD RTE ON OUR DISPATCH RELEASE; WHICH INCLUDED THE TRALR2 DEP; WHICH WAS ALSO LISTED ON THE PDC AS PART OF THE ROUTING. I PROGRAMMED THE TRALR2 INTO THE FMC; THEN SELECTED LNAV AT 400 FT AGL; THEN AUTOPLT AT 1000 FT AGL. THE ACFT BEGAN ITS TURN S ON COURSE; FOLLOWED BY DEP CTL TELLING US TO TURN TO 360 DEG HDG AND MAINTAIN 7000 FT MSL. WE COMPLIED; AND THEN WERE TOLD WE SHOULD BE ON THE STAAV DEP. I REPROGRAMMED THE FMC TO COMPLY AND CONTINUED THE STAAV4 DEP. DEP CTL STATED THAT THIS HAD HAPPENED SEVERAL TIMES RECENTLY. NO FURTHER PROBS OCCURRED DURING THE DEP; NOR WAS THERE EVER A SEPARATION PROB. IN ADDITION; I HAVE NOTICED SEVERAL TIMES THAT THE PDC INITIAL ALT DOES NOT MATCH THE ALT ON THE PRINTED DEP; SO I ALWAYS CALL CLRNC DELIVERY TO CLR THIS CONFLICT. THEY DON'T SEEM TO KNOW THAT OUR PRINTED DEPS DIFFER FROM WHAT THEY WANT ON THE INITIAL ALT. ENSURE THAT THE PDC INFO IS EXACTLY THE SAME AS THE INFO ATC RECEIVES. REMOVE ALL AMBIGUITY FROM THE PDC CLRNC.