HEADING TRACK DEV OCCURS AFTER THE PIC OF A LARGE CPR JET ACCEPTS A REVISED RTE CLRNC; INPUTTING LVS INTO THE FMC VERSUS LAS; 10 NM E OF DAG; CA.

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WE WERE ON AN IFR CLRNC PMD; J6 HEC; J64 FMN. NEAR TOC WE RECEIVED A REVISED CLRNC DIRECT DAG; LAS VEGAS (NO STATE STIPULATED); FMN. I SENSED THAT LAS VEGAS; NV (LAS) WAS MEANT BUT INADVERTENTLY ENTERED LVS (LAS VEGAS; NM). I ASKED FOR AND RECEIVED A ROUTINE CONCURRENCE FROM THE FO. SHORTLY AFTER ENTERING THE CHANGE; AND WHILE PASSING OVER DAG; I NOTICED THAT THE MAGNETIC COURSE FROM LVS TO FMN WAS 282 DEGS WHICH WAS OBVIOUSLY IN ERROR. UNFORTUNATELY I STARTED TRYING TO DETERMINE WHETHER I HAD THE RIGHT FARMINGTON RATHER THAN THE RIGHT LAS VEGAS. SHORTLY AFTER PASSING DAG ON A COURSE OF APPROX 070 DEGS THE CTLR TURNED US L TO 030 DEGS AND ABOUT 30 SECONDS LATER FURTHER L TO 320 DEGS. AFTER ABOUT A MIN; HE STATED THAT HE 'DIDN'T KNOW WHAT HAPPENED BUT THAT OUR CLRNC WAS DAG; LAS VEGAS; NV; FMN' AND SHORTLY AFTER THAT CLRED US DIRECT LAS. I FEEL THAT WE WERE A LITTLE HURRIED BECAUSE OF OUR PROX TO DAG WHEN RECEIVING THE MODIFIED CLRNC; BUT CLRLY OUR REQUEST FOR; AND RECEIPT OF; CONCURRENCE INSIDE THE COCKPIT SHOULD HAVE BEEN OTHER THAN 'ROUTINE.'