How does the author use foreshadowing in That Hideous Strength?

In Sale of College Property, Lewis alludes to inconsistencies within the N.I.C.E, but when the Dimbles tell Jane that Bragdon Wood is unfit to build anything on. If the ground cannot support a building, why does the N.I.C.E. want the wood? The reader gets the idea that Jane's dream is more than just nonsense when the Dimbles ask her to tell them before she speaks of it to anyone else. This event is the first sign that Jane has a gift, and that her dreams are useful and powerful. The presence of the dislocated head in her dream foreshadows the real plan that the N.I.C.E. is working on.