Movies about second chances are fairly common fare in the world of cinema. They provide opportunities to explore the value of themes like redemption and forgiveness. And these notions are usually examined within the context of interpersonal dramas or gentle comedies. So it’s truly unusual to find them as thematic underpinnings in as unlikely a context as science fiction. Nevertheless, such is the case in the new Spielbergian summertime blockbuster, “The End of Oak Street.”