Doing It for the Art: Winsor McCay hand-drew every single frame. Without cels. (An assistant did the backgrounds.)
Hoist by His Own Petard: Mr. McCay was on the giving end. A fellow showed up, claiming to be a journalist writing an article on animation while this movie was being made. Winsor was only too happy to show him how it was done. The visitor was actually John Randolph Bray, who then patented what McCay was doing, then sued him for royalties. The result of the lawsuit was royalties going the other way instead (from Bray to McCay).