Now, I know stars can be blue, but I've never seen a deep blue like this. Are the stars/cluster blue shifted? Even then, that's a large blue shift. And knowing how the universe moves, seeing a blue shift of that magnitude is odd.
I think the blue dots are artifacts of some sort, perhaps a moving object of some kind?
There's no sign of them in the SDSS image of the same piece of sky (being blue they'd certainly show up):