When you encounter Elizabeth in the different rooms separated by a window in her tower.BTW If you see, this is not our real Paris, is Paris in another universe (or in the same one as Columbia) that looks a lot like our real universe but with some differences, like The Return of the Jedi being The Revenge of the Jedi, title is in french (the original name of the film before they changed it to what we know now).Something similar happens in Fringe when you see a movie marquee with Back to the Future starring Eric Stoltz, that was the first version recorded of the movie before they recasted and gave Marty McFly to Michael J Fox.Here is the scene: