Brigadoon (1954)

Factual error: After Gene Kelly sings "The Heather on the Hill", he sees more heather on the other side of the bridge. He starts across but Cyd Charisse freezes in horror, since to cross the bridge would break the spell over the village of Brigadoon. She then drops some of her heather in the middle of the path and runs back to the village. The camera cuts to Gene Kelly chasing after her, but the heather dropped on the path has disappeared.

Andrew Campbell: You'll never find peace by hating, lad. It only shuts ye off more from the world. And this town is only a cursed place, if ye make it so. To the rest of us, 'tis a blessed place.

Question: Can someone explain to me how the enchantment over the village works? I haven't seen the movie for a while, but when Fiona takes Tommy and Jeff to see the teacher who tells them the story of how the place became magical, he says something about the village waking up every hundred years. So is every day a hundred years later in the real world and only a day to them? It just seems strange that Charlie and Jean would wait hundreds of years to get married, and after Harry dies, Fiona's dad says that everyone can find out in the next morning (which would be a hundred years later). Also when Tommy comes back at the end, the village comes to life again even though it disappeared into the mist when him and Jeff were leaving to go back to New York.