AN ACR LGT CREW FLEW THE WRONG ROUTING WITH THE WRONG XPONDER SQUAWK.

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THE FLC WAS GIVEN CORRECT FLT PLAN; WX; FUEL SLIP; WT AND BAL BUT THE WRONG PRINTED PDC. THE FO CHKED IT; INSERTED THE SQUAWK FOR ANOTHER FLT DUE OUT ABOUT THE SAME TIME. I CHKED AND READ THE PDC; CHKED THE SQUAWK AND DEP CTL FREQ; BUT SOMEHOW MISSED THAT THE INFO WAS FOR A DIFFERENT FLT. AT TKOF; I CALLED DEP CTL; CLBING TO 3000 FT. DEP ROGERED WITH NO OTHER COMMENT. SHORTLY; HE BEGAN CALLING ANOTHER FLT (THE FLT WHOSE SQUAWK WE WERE ON I LATER REALIZED). I SENSED SOMETHING AMISS AND CALLED APCHING 8000 FT. DEP SAID CALL DEP ON ANOTHER FREQ AND 'YOU'RE ON THE WRONG SQUAWK.' THE NEW DEP FREQ HAD US CHANGE TO THE CORRECT CODE AND NOTHING MORE WAS SAID ABOUT A CONFLICT OR PROB. SOLUTIONS: WE BOTH CHK FOR JUST SUCH A FOUL UP; BUT THIS EVENT WILL MAKE ME EVEN MORE VIGILANT. SOME ARPTS REQUIRE ACFT TO CALL FOR TAXI; WITH THE SQUAWK. THIS IS A GOOD XCHK; AND REALLY SHOULD BE REQUIRED EVERYWHERE. ALSO; DEP COULD HAVE BEEN A LITTLE MORE VIGILANT. I DID CALL THE CORRECT FLT NUMBER CLBING TO 3000 FT. IF HE SAW A BLIP LABELED AS A DIFFERENT FLT CLBING TO 3000 FT; I WISH HE HAD QUESTIONED IT.