I don't think the cover "ruins" the album or anything, but there are some people who'll catch things like that, and it will bother them always. When I first saw the cover, I thought something looked a bit off, but couldn't figure out what it was. Less than a day later, the angle of the fourth ball had been analyzed and found to be wrong, and the entire analysis was posted here. I really was glad that I didn't have to do the work myself, because now I know what's "wrong" about it. And it was also heartening to know that I wasn't the only one bothered by it.
This is published work. Someone signed their name to it, took credit for it. It is amazing that it could be so sloppy, when just a little more effort would have avoided all of it.