- The final battle scene sparked a small forest fire around the river. Buster Keaton, his crew, and the extras stopped filming to fight the fire.
- Buster Keaton always said that The General was his favorite movie.
- The first try at getting the cannonball to shoot out of the cannon into the cab caused the ball to shoot with too much force. To cause the cannonball to shoot into the cab of the engine correctly, Keaton had to count out the grains of gunpowder with tweezers.
- In the scene where Johnnie and Annabelle refill the water reservoir of the train, Marion Mack said in an interview many years later that she had no idea that she was supposed to get drenched. Buster had not told her what was supposed to happen, so the shock you see is genuine.
- In the scenes with the opposing armies marching, Keaton had the extras (which included Oregon National Guard troops) wear the uniforms of the Confederacy and march in one direction past the camera, then he had them change uniforms to the Union blue and had them march past the camera in the other direction.
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