I think that's authentic. The shadows are realistic, there are no inappropriate sharp edges, the Protegé looks bent, there are fluids running out of one of the cars, and the MKII's bumper is smashed and the license plate is hanging down. And of course the stupid gawkers look authentic.
The only wierd-looking thing I can find is how the MKII appears to be sitting on one corner of its back bumper without that corner collapsing like it seems it should; but maybe that's just a trick of perspective.
I would say that the Mazda got pwned, and the van got a lick for good measure.