MD80 CREW FORGOT TO TURN PAX SEATBELT SIGN ON BEFORE TKOF AND HAD 2 MINOR ALT OVERSHOOTS.

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SEATBELT SIGN OFF ON TKOF; ALT EXCURSION. DEPARTED THE GATE TO A 1 HR 31 MIN WX HOLD; WHERE WE SHUT DOWN AND RESTARTED ENGS. WHEN #1 DEPS WERE RESTOPPED; I SHUT DOWN 1 ENG AND TURNED OFF HIGH LOAD ELECTRICAL ITEMS AND THE SEATBELT SIGN. UPON RELEASE; RESTARTED ALL ENGS AND MADE PA TO FASTEN SEATBELTS. DEPARTED NORMALLY WEAVING AROUND WX. WHILE CLBING; I MADE PA 'FLT ATTENDANTS REMAIN IN YOUR SEATS.' APCHING 15000 FT; RECEIVED 3 CALLS FROM FLT ATTENDANTS ABOUT GETTING UP. WAS ALSO EVALUATING THE WX TO FIND THE PROMISED 'HOLE.' FLT ATTENDANT CALLED TO SAY 'TURN ON THE SEATBELT SIGN;' WHICH I DID. I ASSUME I FORGOT TO TURN IT ON ON THE GND; AS I DIDN'T CYCLE THE NO SMOKE OR TOUCH THE SEATBELT SIGN. ON LEVELOFF AT 15000 FT; THE FO WAS STILL HAND FLYING AND OVERSHOT TO 15300 FT BEFORE I COULD INTERCEDE. HE WAS USING INAPPROPRIATE FGS MODES; AND OVERSHOT THE LEVELOFF AT 17000 FT TO 17300 FT ALSO; STILL HAND FLYING. HE THEN WAS PUZZLED ABOUT THE CTLS AND FGS. HE EVENTUALLY ENGAGED THE AUTOPLT. I CONSIDERED COMMENTS TO HELP AND ALMOST TOOK CTL OF THE ACFT; BUT DID NOT CHOOSE TO DO SO BECAUSE OF THE TENSION IN THE COCKPIT CAUSED BY THE MONTH OF CONFLICT BTWN US. I WILL DETAIL THIS COMPLETELY TO PROFESSIONAL STANDARDS. I FELT HIS USUAL REACTION TO MY INPUTS MIGHT DELAY RETURNING THE ACFT TO ASSIGNED ALT. THIS IS MY FIRST PROB FO AND MAYBE I DID NOT ASSUME CTL QUICK ENOUGH. FACTORS INCLUDE: EXTENSIVE DELAYS FOR WX THE 2 DAYS -- 9.59 LAYOVER AT LGA; FLT ATTENDANT DISTRS; CALLS TO HOU APCH THE NIGHT BEFORE OVER MESSED UP DEP CLRNC DAY PRIOR -- NOT OUR FAULT -- GENERAL POOR CREW INTERACTIONS DESPITE MY EFFORTS DURING THE MONTH.