What's the Difference Between a Place Memory and a Haunted Experience?

One theory is that telepathy was responsible perhaps there was someone out there with extensive knowledge of the history of Versailles and the women tapped into this person's knowledge which resulted in their experience. Another thing that's been proposed is retrocognition which is the opposite of precognition. Since this is referred to as a time slip could the ladies have actually traveled back in time? That would explain why they'd be able to talk to people. But there would also be things it wouldn't explain. Like how did they move back and forth between the present and the past without realizing it? Why was the experience so seamless? I mean there was no flash of light or cloud of smoke