Professor William A. Jacobson over at Legal Insurrection notes the memoirs of Revere himself, as pointed out by the Conservatives4Palin site. In it, Revere recounts an incident during the famous Midnight Ride in which he was accosted by a British military patrol and was interrogated about what his business was on the road. Revere indicated to his British captors that he had warned the countryside of the approach of British troops up the Lexington-Concord road, matching pretty much what Palin said.
"He demanded what time I left Boston? I told him; and added that their troops had catched aground in passing the River, and that there would be five hundred Americans there in a short time, for I had alarmed the Country all the way up . He imediately rode towards those who stoppd us, when all five of them came down upon a full gallop; one of them, whom I afterwards found to be Major Mitchel, of the 5th Regiment, Clapped his pistol to my head, called me by name, & told me he was going to ask me some questions, & if I did not give him true answers, he would blow my brains out. He then asked me similar questions to those above."
So how was it that Palin got it right and just about everyone else got it wrong about Paul Revere and his famous ride?
Most peoples' knowledge about Revere begins and ends with the famous Longfellow poem, which somewhat fudged the actual history of the ride that night in 1775. Palin either has actually cracked open a book or, just as likely, was paying attention to the lecture visitors get when they go to Paul Revere's home, unlike her critics.