If you check some of the videos in the link there are a few with the sonic boom, including one where the windows explode immediately after. Frankly I'm not surprised that many people were hurt given the amount of glass that must have been flying around.

As for the car videos I'm really surprised how laid back the drivers seem to be. The video I would have shot would have been full of "Oh %^%$%$!!!!!!! WHAT IS THAT!?!", especially since the only things I know of that would probably get as bright as the sun are a nuclear warhead or a meteor. So definitely with you on the glad it wasn't a catastrophic hit.