B737-300 CREW HAD THE TKOF WARNING HORN SOUND AT THE BEGINNING OF THE TKOF ROLL AT SNA.

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AT SNA. MY LEG (CAPT). PLANNED STANDARD ACR; FLAPS 5 DEGS; NOISE ABATEMENT TKOF. RUNNING LATE DUE TO A MEDICAL EMER THAT DELAYED DEP ON THE PREVIOUS LEG. THIS WAS LEG 4 OF 6 FOR THE DAY. I TAXIED TO TXWY L TO HOLD SHORT; THEN IMMEDIATELY ADVISED TO TURN THE CORNER; CROSS RWY 19L AND HOLD SHORT OF RWY 19R; EXPEDITE; TFC ON SHORT FINAL. I CALLED FOR TAXI CHKLIST GOING AROUND THE CORNER. I THINK THE FO CONFIGURED THE BLEEDS AT THIS TIME. BEFORE WE REACHED 'FLAPS;' THE CHKLIST WAS INTERRUPTED WHILE TAXIING BTWN THE 2 RWYS BY THE TWR CLRING US FOR TKOF ON RWY 19R. THE FO THEN MADE THE 'FLT ATTENDANTS; PLEASE BE SEATED' CALL. IN AN 'EXPEDITE' MODE BECAUSE OF THE TEMPO OF SNA OPS IN GENERAL AND THE PREVIOUS REQUEST TO 'EXPEDITE;' I TAXIED INTO TKOF POS AND CALLED FOR THE TKOF CHKLIST. THE FO SAID 'WHAT ABOUT THE CHKLIST?' REFERRING TO THE INTERRUPTED TAXI CHKLIST. SINCE I REMEMBERED INITIATING THE TAXI CHKLIST; I ASSUMED WE HAD COMPLETED IT AND SAID 'WE DID THAT; DIDN'T WE?' I GUESS HE HAD ENOUGH DOUBT ABOUT IT TO THINK MAYBE I WAS RIGHT AND ACQUIESCED. HE THEN DID THE TKOF CHKLIST; I DID THE TKOF FLOW AND THEN STARTED UP WITH THE THROTTLES. AS I ADVANCED THE THROTTLES; THE FO NOTICED THE FLAP HANDLE IN THE UP DETENT AND IMMEDIATELY PLACED IT IN THE FLAPS 5 DEGS POS. AS THE AUTOTHROTTLES TOOK THE THROTTLES UP FURTHER; THE TKOF WARNING HORN SOUNDED; AND STILL IN THE 'EXPEDITE' MODE; FOR SOME UNFATHOMABLE REASON; TOTALLY CONTRARY TO 35 YRS OF EXPERIENCE AND TRAINING; I CONTINUED THE TKOF. SEVERAL SECONDS LATER; THE TKOF WARNING HORN CEASED AND I GLANCED DOWN AT THE FLAP POS INDICATOR WHICH; AT THAT POINT; WAS GOING THROUGH 2 DEGS. AT THE 'ROTATE' CALL I AGAIN GLANCED AT THE FLAP POS INDICATOR AND FLAPS INDICATED 5 DEGS. WE CONTINUED THE FLT UNEVENTFULLY TO LAS. CAUSAL FACTORS: CREW HASTE DUE TO STRONG; PARTIALLY SUBCONSCIOUS DESIRE TO EXPEDITE/REGAIN LOST TIME/ RETURN TO SCHEDULE; INTERRUPTION OF CHKLISTS; TEMPO OF OPS; LONG DAY.