Opening of Game of Thrones and Hollow earth

Are you talking about the Armillary Sphere?
That has nothing to do with being inside the Earth, it was a celestial map of the heavens with the earth in the center.

Though it could also technically be considered an Orrery since it appears the sun is at the center. Either way though its about the progression of the heavens, and about time.

I believe that sometimes the two can be somewhat combined into one hybrid:

Anyway, I wouldn't lose sleep over putting too much weight into it. The idea of Dyson Sphere type worlds is not new to science fiction or fantasy settings. Since its a fantasy realm, it's setting is simply used to make it spectacular, not as some type of disclosure by the writers of some secret fact about our world.

Heck, I think too many folks put way to much merit into script writers use of conspiracy and fiction themes, trying to say that they are trying to send messages out and the like. In reality, those guys are on a schedule to write, and they go to all sorts of venues to get inspiration for their works. If its a neat conspiracy theory, then it makes for good TV. I wouldn't be surprised if we had professional writers on ATS all the time. If it generates a bunch more conspiracy theories, that is exactly what they want, because its free publicity for them.