Ok they covered the ball dump problem.
In your first pic, if the nails are wide enough to allow a ball through, then once in a while a ball will drop in that pocket, trust me the balls will take a hell of a bounce quite often.
As to your second pic, the drop on the left with the word go on it banks flipper openings for the pocket between them. The one on the right is a blank drop so the machine looks uniform on both sides.

Doh! 2unes you beat me by a smiggin!