One fun fact about the world is that there is enough molten gold at the core of Earth to coat the land at the surface with a knee-deep layer of the precious metal. Another interesting fact is that the continents are grossly misrepresented on typical maps of the world, with politically less significant landmasses, such as Africa, being reduced in size and more significant landmasses, such as North America, being dramatically increased in size.
If it were possible to really alter the size of the planet, specifically down to the size of a pool ball, the Earth would actually be smoother than that regular pool ball. This is because allowable imperfections for a pool ball are about 0.002 inches, and at that scale, even Mount Everest and the Marianas Trench would be within the imperfection tolerances of pool balls.
Another fun fact involving a hypothetical scenario is that if a person were to create a tunnel through the earth, it would take approximately 40 minutes to fall through to the other side. The person falling through would just about reach the surface at the other end before falling back, and this process would go on indefinitely, similar to an orbit.