Answer to "ghost touch while charging"I have seen this problem when using a non apple charger and with a non (apple)certified cable on an iphone. Could be the same for the Moto.
Answer to "small part dropped out during repair, where does it go?"Yes the gold piece is the camera ground clip and is held in place with a screw on the upper left of the circuit board. The black piece is a protector that is on the upper left/top of the circuit board for the Screen connection ribbons to bend over and connect to the circuit board.