ALTDEV ALT OVERSHOT. IMPROPER COCKPIT SET UP WITH TRANSPONDER CODE SET INCORRECTLY. FLC CITES FAA ACI INTERFERENCE DURING PRESTART.

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LAST LEG OF A 4 DAY TRIP 10 HRS INTO A 12 HR DUTY DAY. FAA AIR CARRIER INSPECTOR ASKS FOR CAPTS LICENSES WHILE I AM COPYING CLRNC. CAPT INFORMS ME THAT INSPECTOR WANTS TO LOOK AT MY LICENSE AND MEDICAL. RETURNING TO MY SEAT I LOOK ON THE PAD I WROTE MY CLRNC ON. SQUAWK AND ALT ARE ALREADY SET IN. HOWEVER; I AM LOOKING AT THE WRONG CLRNC ON THE PAD. IT WAS THE PREVIOUS ONE. I SET IN WRONG DEP FREQ; WRONG SQUAWK; WRONG ALT. NEVER NOTICING ON TAXI WHILE RUNNING THE CHKLISTS. AFTER TKOF I CALL TWR BACK TO GET FREQ FOR DEP. BY THE TIME I CALL THEM HE (DEP) SAYS I DIDN'T HAVE RADAR CONTACT AND WOULD I RESET TRANSPONDER TO CORRECT CODE. I NOTICE IT IS ALSO WRONG. HE CALLS BACK AND SAYS OUR CLRNC WAS 2500 FT BUT CLB TO 10000 FT. I LOOK BACK TO MY PAD AND SEE THE OTHER CLRNC WITH THE CORRECT CODE; FREQ; AND ALT. I WILL ALWAYS COPY NEW DEP CLRNC ON CLEAN PAPER FROM NOW ON. NORMALLY THE CAPT OR I WOULD HAVE NOTICED THE IRREGULARITY. ALSO IF I HAD SET THE NEW INFO IN ALL THE WINDOWS BEFORE GETTING OUT OF MY SEAT TO SHOW MY FLYING LICENSE AND MEDICAL TO THE INSPECTOR IT WOULD NOT HAVE HAPPENED. HAD THE CAPT NOT BEEN DISTR WHILE SETTING UP HIS PANEL AND LISTENING TO THE CLRNC; CHANCES ARE WE WOULD HAVE CAUGHT MY MISTAKE. THERE WAS NO TFC CONFLICT; BUT WE EXCEEDED 2500 BY AT LEAST 1000 FT BEFORE THE CTLR BROUGHT IT TO OUR ATTN. SUPPLEMENTAL INFO FROM ACN 200502. I WENT TO THE ARPT AND GOT INTO THE L SEAT. IT WAS MY TURN TO FLY (WE NORMALLY SWAP LEGS FO WAS ALREADY IN SEAT ABOUT 20 MINS PRIOR TO DEP. FAA AIR CARRIER INSPECTOR ARRIVED; INTRODUCED HIMSELF AND SAID 'LET'S GET THE FORMALITIES OVER WITH; LET'S SEE YOUR LICENSE AND PHYSICAL.' MEANWHILE; THE FO WAS COPYING THE ATC CLRNC; I DIDN'T HEAR THE CLRNC BECAUSE I WAS TALKING TO THE FAA AND THE FO DIDN'T HEAR THE REQUEST FOR OUR LICENSES AND PHYSICALS. I WAS NOT 'IN THE LOOP' TO LISTEN TO THE CLRNC BECAUSE OF THE AFOREMENTIONED CONVERSATION WITH THE FAA. OUR NORMAL PROCEDURAL FLOW WAS INTERRUPTED.