B737 CREW WAS ASSIGNED A VISUAL APCH TO FOLLOW TFC AHEAD. CAPT WAS CONCERNED ABOUT SPACING SO HE SLOWED AND INCREASED INTERCEPT ANGLE. CAPT AND FO WERE WATCHING DIFFERENT TFC. IN THE CONFUSION; CREW OVERSHOT TURN TO FINAL. CREW CORRECTED AND AN UNEVENTFUL LNDG WAS MADE.

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VECTORED TO VISUAL FINAL APCH WITH ILS TUNED AS BACKUP. TFC FOLLOWING IN SIGHT; ALSO ONE ON FINAL FOR S COMPLEX. FO HAD OUR TFC IN SIGHT. I SPOTTED ONE FOR S COMPLEX (I MISTOOK HIM FOR OUR TFC; ARPT IN SIGHT BUT HAZY). WE WERE GIVEN A HDG AND CLRED FOR A VISUAL RWY 24R. THE HDG PUT US INTERCEPTING THE S COMPLEX TFC WHICH I THOUGHT WAS OUR TFC. I WAS WORRIED ABOUT SPACING ON THAT HDG; SO I SLOWED WAY DOWN; TOOK UP A SPACING HDG; AND WATCHED HIM AND THE LOC NEEDLE. SUDDENLY; THE NEEDLE CAME ALIVE AND THE FO SHOUTED WE WERE OVERSHOOTING. I MADE AN IMMEDIATE TURN BACK TO INTERCEPT FINAL FOR RWY 24R. WE BOTH THEN REALIZED WE WERE WATCHING DIFFERENT TARGETS. I DID NOT CHK LOC FREQUENTLY ENOUGH. WE ALSO COULD HAVE COMMUNICATED BETTER WITH EACH OTHER BECAUSE THERE WAS NO SPACING PROB ON OUR ACTUAL FOLLOWING TFC. WE DID NOT TRANSGRESS INTO THE S COMPLEX FINAL PATH BUT TOO CLOSE FOR GOOD SAFE OPS. SUPPLEMENTAL INFO FROM ACN 403080: APCH GAVE US A HDG OF 220 DEGS; TOLD US TO GO TO TWR; AND POINTED OUT ADDITIONAL TFC ON OUR NOSE (VIA THE 220 DEG HDG) FOR THE S COMPLEX (RWY 25L/R). THE CAPT WAS CONCERNED ABOUT THE TFC CALLED OUT FOR THE S COMPLEX; AND THOUGH I POINTED IT OUT TO HIM; HE DID NOT HAVE A CLR VISUAL ON IT OR THE TFC AHEAD OF US ON RWY 24R. I TOLD THE CAPT THE S COMPLEX TFC ON OUR NOSE WAS NO FACTOR; AND LOOKED DOWN AT THE APCH PLATE TO CONFIRM GND FREQ AND ENTERED IT ON THE RADIO HEAD. I THEN LOOKED UP AND SAW ON THE ILS RAW DATA; AND THEN VISUALLY; THAT WE HAD OVERSHOT RWY 24R AND WERE SLIGHTLY L OF RWY 24L'S CTRLINE. I IMMEDIATELY CALLED FOR THE CAPT TO COME FULL R (30 DEGS OF BANK) FOR RWY 24R. THOUGH THE CALLOUT FROM APCH ON THE ACFT TO THE S COMPLEX WAS AN UNNECESSARY DISTR; BETTER XCHK OF THE RAW DATA LOC INFO WOULD HAVE PREVENTED THE OVERSHOOT.