Paul Revere falls off his horse. For some reason, Griffith has Revere ride up the steps of people's homes to announce "The British are coming!" as if he has to shout this at their doors. Backing down one set of stairs, Revere's horse falls, tossing the actor, who quickly recovers and shows considerable concern for the horse's welfare. Griffith left in the spill.
During the battle of Concord, just as Nathan is about to fire his rifle, a Minute Man on his left gets shot and drops his rifle on Nathan's, causing Nathan to fire wildly. Apparently, no retake was shot and the accident remained in the film.