Absent context I'd definitely take the mismatched-windows exterior shot as the result of something like the Internet-famous time that amateur (in Spain, I think?) tried to restore a painting of Jesus.

[EDIT] My point is, if someone told me some other parts of the building were a mistake, much less something like the Sistine Chapel, I'd be like "no way". That particular view of the building? Someone told me it was a mistake, I'd be like "haha, yeah, clearly, hope they fix it so it doesn't keep dragging down the rest of the building"