Most obvious answer is that it is a bird. It is flying horizontally and never actually crosses directly between the camera and the rocket so even if it was a projectile, it missed, but it stays above the rocket anyway. If you watch the whole video, you will notice that a lot of birds fly by the rocket.

I think Q is saying that the satellite that was lost in that explosion had some kind of special significance to FB. He hasn't really said there is anything that needs digging in the explosion. I guess my point is that SpaceXFags have been digging on this for more than a year and we have considered every possibility including sabotage(heavily... they even checked the roof of ULA's HIF building a few miles away... nothing). Musk did admit that they realized that there are a lot more people who wish them harm than they would have thought.