Revelations unearthed from 10 hours of extras: Director Robert Zemeckis excised several scenes from the first film in which Michael J. Fox said "shit" a lot; the second movie became dark in tone when Crispin Glover made outrageous demands and had to be written out; had Zemeckis known there would be a second film, he never would have had Fox's girlfriend in the DeLorean at movie's end; and Kirk Cameron made some BTTF special in which he answers mail, for some reason. Oh, and Fox had a lot of fun. He says it right there on disc one. And two. And three. Amazing, though, they could fit three movies on three DVDs. Took four for the first Lord of the Rings. By the time that trilogy's done, they may whittle 'em down to 24.