Early Production games differ from the rest of the production run because they have no Special on reaching letter E of ROCKET on the playfield, thus no Special light on the left outlane, and no left outlane kickback. Also, they feature a bottom arch with different graphics, different colors on the playfield and the cabinet (while the plastics are the same), and a different playfield glass, being the familiar sliding glass, while later in production the glass was changed to lift upwards from the front in a metal frame.
