A D328 CREW; ON ARR TO DEN; UNDERSHOT THEIR ASSIGNED ALT.

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WE HAD AN EARLY MORNING DEP FROM LNK. I WAS DOING IOE WITH A NEW HIRE FO. THE 3 DAY TRIP HAD BEEN MOSTLY SHORT LEGS; SO I WAS BEHIND ON PAPERWORK AND INSTRUCTING. ABOUT 15 MINS FROM THE TOP OF DSCNT POINT; WE WERE RERTED FROM THE LAWDR ARR TO THE SAYGE ARR. WE WERE JUST FINISHING UP A DISCUSSION ABOUT THE FMS FUEL MGMNT. WE PROGRAMMED THE NEW ARR INTO THE FMS AND THEN WE WERE TOLD TO CROSS SAYGE AT 14000 FT. I ENTERED THAT INTO THE FMS AND PROCEEDED TO EXPLAIN THE VNAV TO THE FO. AS THE AIRPLANE STARTED DOWN; I WAS SIGNING OFF MY LAST FEW ITEMS ON MY IOE CHKLIST AND THE FO WAS GETTING DEN ATIS. WHEN HE WAS DONE GETTING THE ATIS; WE GOT HANDED OFF TO DEN APCH. WHEN WE CHKED IN WITH APCH HE CLRED US DOWN TO 13000 FT. AT THAT TIME I REALIZED THAT WE HAD JUST CROSSED SAYGE AT ABOUT 16500 FT. WE LEVELED AT 13000 FT AND THEN REALIZED THE ALTIMETERS WERE STILL SET TO 29.92 WITH A QNH OF 30.37. WE CORRECTED THIS AND REALIZED THAT WE BETTER CATCH UP. THE REMAINDER OF THE ARR; APCH AND LNDG WERE UNEVENTFUL. I SPENT SO MUCH TIME TRYING TO TEACH THE NEW FO ABOUT THE ACFT AND THE OP THAT I DIDN'T GIVE US ENOUGH TIME TO LET HIM GET HIS JOB DONE. THIS AND THE EARLY MORNING DEP FOR THIS LEG HELPED US INTO A POS WHERE WE WERE BEHIND BEFORE WE STARTED THE ARR AND WE MADE 2 MISTAKES BEFORE WE CAUGHT UP WITH WHAT WAS GOING ON. SUPPLEMENTAL INFO FROM ACN 566630: AS WE APCHED THE INTXN FOR OUR XING ALT; IT SOON BECAME APPARENT THAT WE WERE NOT GOING TO MAKE OUR XING ALT. WE FAILED TO MEET IT. THE PNF SHOULD HAVE VERIFIED WITH THE PF THAT THE CORRECT ALT WAS ENTERED INTO CORRECT INTXN ON THE FMS. IN OUR DSCNT; THE PF NOTICED HE HAD ENTERED THE CORRECT ALT INTO THE WRONG INTXN. BOTH CREW MEMBERS SHOULD VERIFY ALL VNAV XING POINTS; LIKE WE USUALLY DO WITH RTE CHANGES AND ALT CHANGES. A CHALLENGE/RESPONSE SYS; SO ONE CREW MEMBER MUST VERIFY THE CORRECT INFO PRIOR TO ACTIVATING THE AUTOPLT MODE.