CRM BREAKS DOWN FOR CREW ON APCH TO DFW; TX; RESULTING IN ERRORS IN BOTH ALT AND HDG ON THE ARR.

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WHILE FLYING THE BOWIE 5 ARR INTO DFW; A CHAIN OF ERRORS DEVELOPED. WE WERE CLRED DIRECT TO BAMBE INTXN AND GIVEN A DSCNT. I RESET THE GPS (WHICH WAS BEING USED FOR PRIMARY NAV) THEN RESET THE #1 VOR/HSI. I ASKED MY CO-CAPT TO TUNE HIS VOR/HSI TO THE STAR. I THEN NOTICED THAT THE ALT PRESELECT HAD NOT BEEN RESET TO OUR NEW ASSIGNED ALT. I MENTIONED THE ERROR TO MY CO-CAPT; THEN RESET THE ALT PRESELECT. AT THE SAME TIME; REGIONAL APCH GAVE US 3 NEW ITEMS. A DSCNT; A HDG CHANGE TO BE EXECUTED AT SILER INTXN; AND A FREQ CHANGE. I BEGAN THE DSCNT AND TURNED TO REINTERCEPT THE STAR (AS ASSIGNED); NOTICED THAT THE ALT PRESELECT HAD NOT BEEN CHANGED (FOR THE SECOND TIME). I ASKED THE CO-CAPT TO RESET THE ALT PRESELECT; THEN MENTIONED THAT HE HAD NOT CHANGED FREQS. I THEN ASKED HIM TO VERIFY THE ASSIGNED HDG AFTER SILER (I HEARD 180 DEGS; WHILE 170 DEGS IS PUBLISHED). HIS REPLY 'SPLIT THE DIFFERENCE. FLY 175 DEGS.' WHILE TRYING TO RESOLVE THIS CONFUSION; I FLEW PAST SILER AND DID NOT MAKE THE HDG CHANGE OR REDUCE SPD AS PUBLISHED. ATC ASKED OUR SPD; OUR REPLY 240 KTS. ATC THEN SAID '210 DEGS IS PUBLISHED AND YOU MISSED YOUR TURN; TURN R TO 210 DEGS; DSND AND MAINTAIN 3000 FT.' I IMMEDIATELY COMPLIED AND REDUCED SPD. THE REST OF THE FLT WAS UNEVENTFUL. CONTRIBUTING FACTORS: FLT DECK WORKLOAD IN THE APCH CTL AREA. POOR CRM. SERIES OF 3 COMMANDS AT ONCE FROM ATC. I WAS SO BUSY MONITORING THE CO-CAPT'S ACTIONS AND INACTIONS (TRYING TO PRECLUDE AN ALT BUST); THAT I DID NOT DO MY JOB; IE; FLY THE STAR.