As some reviewers have said, the supernatural (ghost) elements could explain what some have called the "plot holes" in the story line and/or character motivation. Another possibility is that the events as we see them are part of a nightmare world or dream imagery in which actual events are "relived" in a surreal, disjointed sequence in which memories can be magnified and distorted. Both types of experience are not a precise replay of reality, though they have a basis in a reality. Another possibility is that the film-makers' goal is a depiction of their conception of what Purgatory could be like, in which the "sinner" relives portions of his/her life as an end to eventual redemption; a part of that redemption could include a reaching out (into the real world) in an effort to protect others from a similar fate by reaching out (or "across" time and space)to make contact with living people -- some of whom (as in the movie) can "see" and react, while others cannot.
How well this works in the eyes of an audience is another matter, of course. As with all movies, a willing suspension of disbelief is necessary for the degree of enjoyment one derives, and that is effected by (though not always satisfactorily controlled by)the acting, direction, special effects, etc. In the case of REST STOP (I haven't seen the sequel), the success of such an intention is for me only about 50/50, though I appreciate the multiple levels of possible meaning. Certainly it is not "the worst" movie of all time -- unless one has seen only one movie.
