Nonlocal correlations are one of the spookiest things about quantum mechanics. Einstein didn't much care for quantum mechanics, he tried to show that quantum mechanics was inconsistent with his special theory of relativity with the EPR paradox. While thought provoking, the EPR paradox did not end up being viewed as a fatal flaw for quantum mechanics.
Experimental schemes for actually testing quantum nonlocality have required quite a bit of alignment and calibration of different parts of the experiment which might make a skeptic wonder if such experiments really are an ironclad test of nonlocality. The preprint Guaranteed violation of a Bell inequality without aligned reference frames or calibrated devices is a clever test of quantum nonlocality which doesn't require a lot of the alignment and calibration steps used in other approaches.
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