Put more thought into a response, here:

If the earth was somehow hollow and the water somehow didn’t all immediately fall straight “up” to the core when at the slowest spinning parts of the planet, I should be able to look up and see Japan, let alone the fact that all of the rock and magma should fall to the center as well due to Gravity. Even light scattering through the atmosphere wouldn’t be able to hide the fact that the horizon went ‘up’ forever

If the gravity we experience here on earth was caused by centrifugal force, you would be near weightless near the poles, as things generally only spin in one direction.

If the earth was hollow, there would be no night sky, just the twinkling lights of other cities past the glowing molten core that would serve as the sun. A fascinating setting for a sci fi novel if you managed to work around everything I mentioned (man made planet perhaps?), but ultimately not plausible.