My favorite trivia on Barry Lyndon is the fact that he built a camera out of satellite lens to get the necessary aperture to shoot candle lit scenes with no artificial lighting. But with such a massive aperture, the actors had to stay absolutely still to remain in focus, which you can tell in the card playing scenes.

Though I love the film, the very slow rythme makes it hard to re-watch, and probably impenetrable to today's young audience.