During the boxing scene, when the two fighters enter the ring; Battling is wearing his robe in one shot, and in the next shot it is off.
The intertitles state, "The Buddha says, 'What thou dost not want others to do thee, do thou not to others.'" It was actually not the Buddha but Confucius' teaching.
While Lucy is looking into the window of Cheng Huan's shop, director D.W. Griffith, in his shirtsleeves and wearing a vest, can briefly but very clearly be seen reflected in the window, briskly walking into the shot and sitting down in a chair beside the camera. This occurs in the shot immediately following the intertitle "The girl with the tear-aged face."