They're likely wearing black all of these games in order to suck up as much heat as possible as it's still pretty cool out there. By May they'll get back to the greys here and there.
The wall is like 10' tall and the ball hit the top of a fan's outstretched arms. It would've required Yao Ming if Yao Ming had a 48" vertical. It wasn't like Alonso's which bounced on top of the wall