I found this article the other day that went out and captured a bunch of obviously images done in Photoshop, that were just a bit off. Photoshop is the graphic workshop these days. There isn’t any other product that comes close to what Photoshop has to offer. It’s pretty incredible and must be learned if you are involved in anything graphics design or web. But sometimes when Photoshop work is done, the concentrated effort is completing the work, rather than noticing what people will see in the end. This was an example of an obvious brush up that went way too far.
There are many other examples, find them here:
There is actually an entire blog on this subject. Looking through the pictures can be hard to notice at first, but these guys find them. In this one, The Big Bang Theory, actress Kaley Cuoco who plays Penny, has only three fingers.