Andy took a number of liberties with the story of Paul Revere's famous ride, no doubt to make it more interesting to Opie and his pals (added a little jam as Andy put it). For one, Paul Revere's warning and famous ride were planned well ahead of time. The signal was planned by several early patriots, including Revere so that if he were to see the lights burning in the Old North Church he would know exactly what to do (Andy says Paul Revere "Didn't know what to do but he know'd he had to do something). Also, although it's been speculated for a century or more, no one really knew the name of Revere's horse (the name Nelly was never even mentioned as a possibility) but it is known that the horse did not belong to Paul Revere but was most certainly borrowed. Another fib - Paul Revere was hardly as poor as Job's turkey. He was actually a wealthy and prominent Boston silversmith.