The sand is put there only for that shot. to show that the bairge had some interaction with the sand than just stays there and to add depth :). I also added something that nobody seems to notice (not your fault its very subtle), is that i add sand particles to the camera because of the flyby of the second boat just a sec before ;)

On an other note here some more errors for 005's list.

First to replace the mirror shot of this.

Andi hope ady will do his magic as he did in the holo table and vader's helmet here:

Stabilize the fence

-Angel