Why is my mac showing a Super Nintendo-esque glitchy interface on login screen?

It makes my skin crawl. I am beginning to think that this Yosemite OS update was a mistake. This as well as other small interface glitches never happened before I downloaded the update, and I have had my Mac for about three years now. It comes right back to normal when I log in, but it shows that at times when I wake my Mac from Sleep mode. Is it crankiness perhaps?

That looks like  hardware fault, not a software issue. Suggest you contact Apple for a exam appointment.
We don't know which Macbook Pro you have but eh 2011 series seem plagued with video hardware issues if you look at the macbook Pro forums.

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