Director's cut version vs. Original theatrical cut

I have seen SNF many times over the years, but I could find no real difference between the '77 version and John Badham's 2017 Director's cut. The latter is supposed to be 4 minutes longer and extends some scenes, but I discerned no real difference between the two. I would appreciate anyone who can point me to where the director's cut extends certain scenes. I suppose we should be thankful Badham's cut does not deface the original, unlike his terrible version of the 1979 Dracula which drained the film of color because that's the way he wanted to film it originally, but that's not how moviegoers originally saw the film.