Hope it's ok to post multiple times, I thought to keep one item per post, for clarity.
Oh yeah, well first there’s the lines on the actual map itself which are from when the scenery was acquired by IPACS. As for the lowres part, there are multiple areas I’ve seen this, where in-game the terrain switches from well-rendered to blurry. One part near Denver, another in LA mountains, near Big Bear and San Bernardino airports. Must be normal because some areas don’t need hi resolution because there’s nothing there in some cases. Cities and big areas are higher res though, which is all that matters 😀