Spoiler alert: This article discusses the ending of the book and the film “The Power of the Dog.” There has been a buzzy discussion among audiences who have seen Jane Campion’s “The Power of the Dog.” It has to do with the artful, understated ending of the film, which has inspired collective questions of “What just happened?” even from those who paid close attention to the dark, subtle shifts in the plot and the violence buried just under the topsoil of the story’s surface.But that final moment you see in the movie wasn’t always what Campion envisioned at first for the her Western, the clear front runner in this year’s Oscar race with a dozen nominations. Yes, a murder is committed at the end of the movie (as described here in this explainer), but it’s hidden in plain sight instead of being spelled out more clearly as Campion and her team initially planned.