B737-300 CREW MAY NOT HAVE COMPLIED WITH ALT AND SPD XING REQUIREMENTS AS GIVEN BY THE ATCT RADAR CTLR ON THE SADDE 6 INTO LAX.

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CDU PROGRAMMING. ON SADDE 6 ARR TO LAX; WE WERE GIVEN SYMON INTXN AT 12000 FT; 250 KTS. I APPARENTLY PUT SADDE AT 12000 FT; 250 KTS PROBABLY BECAUSE OF SEEING 250 KTS AT SADDE ON CHART. THIS OCCURRED WHILE FO WAS OFF GETTING THE ATIS. BEGAN THE DSCNT AS PROGRAMMED IN CDU; WHICH WOULD NOW HAVE ME TOO HIGH AT SYMON. SOMETIME LATER; WE WERE GIVEN THE COMMON CLRNC OF 'DSND AND MAINTAIN 10000 FT; 250 KTS.' I THINK THIS WAS PRIOR TO SYMON; BUT IT MAY HAVE BEEN AFTER -- HENCE; THIS RPT. THIS CLRNC WAS GIVEN WHILE THE FO WAS NOW OFF GETTING A GATE. BREAKING OUT OF THE CLOUDS; WE APPEARED HIGHER TO ME THAN NORMAL; AND THEN I DISCOVERED THE PROB. CONTRIBUTING FACTORS: ONCE AGAIN AN ERROR OCCURRED WHEN THE CLRNC GIVEN WAS DIFFERENT THAN WHAT APPEARS ON THE STAR OR SID. ALSO; IT SEEMS LIKE MANY OF THESE TYPES OF ERRORS OCCUR WHEN 1 PLT IS OFF THE ATC FREQ. THIS IS ALWAYS AT A BUSY TIME (OPC; CHKLISTS; TURB; ALT CHANGES; COURSE CHANGES; FREQ CHANGES; TFC; PAX CONNECTS; PFC CANNOT VERIFY CDU CHANGE; ETC). MY KINGDOM FOR COMMERCIAL RADIO!