At least twice I’ve watched a movie that I’d seen before and there was a missing piece of dialogue or short scene. For example, in Full Metal Jacket when they were getting their assignments and Joker was assigned to Stars and Stripes, I remember the drill sergeant asking him how he got such a cushy assignment and Joker said “Sir! I wrote for my high school paper, sir!” Do they cut a few seconds of dialogue out, and if so, why?