Ghost images of previous content have been widely demonstrated on some Retina MacBook Pros, as in the above video. A support thread on apple.com on the issue currently runs to over 7000 posts across almost 500 pages. Apple uses displays manufactured by both Samsung and LG in its Retina laptops, and it has been strongly indicated that the issue affects mostly machines with LG screens. Apple has so far made no statement on the issue beyond a support document in which it describes “image persistence” as a characteristic of IPS displays and gives some advice on minimizing the effects.
I would be pissed if that happened to my laptop.