If a writer seeks to establish an alternate history/geography, it had best be presented on a far more solid backdrop than, "is this a geographical error or a different universe?" The fact that point X is six hours from point Y is not how you do that.
If a beta says, hey, your facts are wrong and the writer says, that is a plot point to establish --whatever-- then the beta did due diligence. (Plus, the beta can snap at the writer's heels if it doesn't ever come up again, or make a lick of difference!)
Human nature makes us not want to say: Ooops! Human nature makes us want to say: I meant to do that!