FLC OF WDB ACFT CHKS FLT PLAN AS LOADED INTO COMPUTER AND QUESTIONS ONE LEG. DUE TO INTERRUPTIONS THEY FAIL TO CHK THAT LEG AND END UP OFF COURSE ONCE AIRBORNE.

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AS A RESERVE PLT; GOT CALL FOR FLT WHICH WAS TO DEPART DTW AT XY00. I ARRIVED AT ACFT APPROX XX25-XX30; WHICH DID NOT ALLOW A LOT OF TIME. AFTER CAPT LOADED FLT PLAN INTO COMPUTER; MY JOB IS TO CHK RTE AND LEGS OF FLT PLAN. ON THE DEP; WE WERE TO FLY RWY HEADING; RADAR VECTORS TO DUNKS INTXN; AS FILED; J-70; ETC. DUNKS WAS IN THE COMPUTER; THEN BAE; NOT J-70. I ASKED CAPT IF DUNKS TO BAE IS J-70; AND HE SAID HE WOULD LOOK IT UP ON MAP. I SAID I WOULD LOOK IT UP TOO. HOWEVER; I THEN CONTINUED CHKING THE REMAINDER OF THE RTE AND LEGS; ASSUMING HE WAS LOOKING IT UP. AT THIS POINT AN AGENT CAME INTO THE COCKPIT; ALONG WITH OTHERS; AND WE WERE DISTRACTED AND WE BOTH FORGOT TO GO BACK AND CHK THE CHART. I DID FINISH CHKING RTE AND LEGS; BUT DID NOT DOUBLE-CHK MY QUESTION. ON DEP WE WERE CLRED DIRECT DUNKS; AS FILED. WE SHOULD HAVE FLOWN DUNKS; J-70 PMM; BAE; ETC. AFTER DUNKS; WE STARTED HEADING FOR BAE (ON LNAV). ATC QUESTIONED OUR NAV SOON AFTER PASSING DUNKS; SAID WE WERE 10 MI N OF COURSE. WE REQUESTED DIRECT BAE AND IMMEDIATELY WERE GRANTED OUR REQUEST. NO FURTHER COMMENTS FROM ATC. I LET MYSELF GET TOO HURRIED WHICH LED TO MY MISTAKE. IT IS A VERY BUSY TIME BEFORE DEP WITH A LOT TO DO. WHEN TIME IS SHORT AND WITH SUBSEQUENT DISTRACTIONS IT IS EVEN MORE CRITICAL TO CHK OUT QUESTIONS AT THE TIME THEY ARISE AND NOT PUT THEM OFF; SO THEY CAN BE FORGOTTEN.