@jcarlson: there are fans in the machine which could make that clicking noise. Is that noise happening at certain times/occasions? SSD is all electronics so that can't be making clicking noises like you are describing but those fans could. As well as the trackpad (if you rest your wrists on it, I wonder what happens).
The discolourations are rather difficult to see on that image. The quality of the image is so bad that the poor image alone could be the culprit. By the looks of it I think it is just the common reflection of some sort of light source in it.
@SlickVik: That thread shows the exact opposite, there are hardly people agreeing with you and all the likes are going to the people disagreeing with you.
@Pootmatoot: the fact that there threads about those issues are non-existent on the first page of this subforum says enough.
There will always be issues with any product, that's how the statistics are but here on MacRumors all hell breaks lose when someone has a scratch he found with some electron microscope. Things are grossly over-exaggerated here. Oh, the solution is also rather easy: contact the seller and get it sorted. It's what grownups do.