First of all, upon closer inspection of the "duplicated" sections of the image, it is easy to see that the duplication is not an exact replica and that there are numerous differences to find. Secondly, say the image was doctored, what purpose would there be in that? This isn't an image of something impossible to create. This is an crash landing site here on earth so if the goal here is to make a real looking image of a crash site on earth, then why would photoshop be necessary at all? The aircraft itself doesn't have any problems, so what does that say for the stuff on the ground above it? Couldn't they have just used pieces of the ground that don't, at first glance, look duplicated?
As far as explanations go, I say that it is possible that pieces came off the aircraft in such a way that they skipped off of the craft. Purely conjecture of course but based on looking at a close up of it, it doesn't appear to be a duplication anyway.