A B767 FLT CREW FAILS TO MAKE AN ALT XING RESTR AT MITTS INTXN AFTER THEIR ARR AND RWY CHANGE ALTERED THEIR COCKPIT SETUP AND PLANNING DURING AN EXPECTED CIVET ARR AT LAX; CA.

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IN DSCNT TO FL190 ON CIVET 4 APPROX 4 MI FROM CIVET. SLOWING TO 250 KTS PER ATC ASSIGNMENT; CLRED TO DSND VIA MITTS ARR. THIS WAS A CHANGE FROM INITIAL ASSIGNMENT OF CIVET 4. I HAD MITTS IN RTE #2 AND SELECTED AND EXECUTED SAME. THIS WAS AN EXTREMELY LATE CHANGE AND FO WAS LATE CONTINUING DSCNT DUE ACFT SLOWING. WE MISSED THE 17000 FT OR BELOW BY ABOUT 800 FT. I ADVISED APCH THAT WE WERE GOING TO BE LATE AT CIVET. CTLR ONLY RESPONDED WITH 'OK; AT OR BELOW.' THIS WAS CONFUSING TO ME AS I WAS CONCERNED REGARDING THE 17000 FT OR BELOW AS OPPOSED TO THE 14000 FT OR ABOVE PORTION OF THE XING CLRNC. THE FO SAID THAT HIS HSI SHOWED THE MITTS AS A BLUE DASHED LINE. I LOOKED; AND HIS HSI DID INDEED SHOW MITTS AS NOT ACTIVE. MY HSI SHOWED THE MITTS AS ACTIVE AND MAGENTA. THIS CAUSED FURTHER CONFUSION. THE FO THOUGHT WE WERE GOING TO RWY 25R INSTEAD OF RWY 24R AND RETUNED THE LOC TO RWY 25R. I RETUNED TO RWY 24R; AND WE CONTINUED APCH PER NORMAL PROC. THIS WAS A VERY LATE CHANGE AND WAS EXACERBATED BY SEVERAL ADDITIONAL ITEMS.