AN ACR FLC FLYING A B737-700 FROM LBB RPTS AFTER TKOF CHKLIST ITEMS PERFORMED IN AN IMPROPER SEQUENCE.

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I WAS MAKING A NORMAL TKOF. AT 50-100 FT AGL I CALLED FOR 'LNDG GEAR UP.' THE FO RESPONDED 'LNDG GEAR UP.' I NOTICED AN UNUSUAL NOISE IN THE NOSE TIRE AND LOOKED AT THE LNDG GEAR HANDLE AND FOUND IT IN THE DOWN POS. I LOOKED AT THE FO AND RESTATED 'LNDG GEAR UP.' HE RESPONDED AGAIN 'LNDG GEAR UP.' I THEN LOOKED AT THE FLAP LEVER AND REALIZED THAT ON THE INITIAL CALL FOR THE GEAR; HE HAD PUT THE FLAPS UP INSTEAD OF THE GEAR. ALL THIS HAPPENED FAIRLY QUICKLY. I BELIEVE HE FINALLY GOT THE GEAR UP BEFORE THE FLAPS HAD FULLY RETRACTED; BUT I AM NOT SURE. WITH THE INITIAL NOISE I HAD DECREASED MY CLB TO APPROX 15 DEGS INSTEAD OF THE NORMAL 20 DEGS. NO STICK SHAKER OR DEGRADATION OF FLT WAS NOTICED. THIS WAS THE THIRD LEG OF THE FIRST DAY OF A 4 DAY TRIP FOR MY FO. NEITHER OF US WERE TIRED. THERE WAS NOTHING OUT OF THE ORDINARY THAT I CAN TELL; OTHER THAN MY FO DID ADMIT LATER THAT HE HAD A HEADACHE. HE IS A HIGHLY QUALIFIED FO WITH OVER 4 YRS AT THE COMPANY. THE ONLY OTHER THING WE MIGHT ATTRIBUTE TO THIS INCIDENT IS A VERY HIGH COMFORT LEVEL WHICH MIGHT HAVE LOWERED HIS CONCENTRATION.