Looks as if they have reversed the conection of the green/neutral connection in the photos.The three wire one should have the green/neutral ground wire connected to the silver terminal, and the four wire one should have the green/neutral ground wire connected to the green ground screw. This should not be a problem as almost everyone I meet is an electrician (meaning they have no qualms about doing their own electrical work). It took the NEC over thirty years to make up their mind on this one didn't it.
The other end of green wire connected to the “ground screw” in the top picture is connected to the neutral on the terminal block. The factory connection to the neutral terminal is not visible in these pictures and sometimes not easily visible when looking at the appliance. If a 4-wire cord is used the neutral-ground bond is removed by disconnecting the green wire from the ground screw and connecting it to the neutral terminal which connects it to itself. The other option is to insulate the green wire and leave it floating in the case but it’s safer for the manufacture to tell you to connect it to the neutral bar to make sure it doesn’t come into contact with the cabinet of the dryer.
If you don’t believe me disconnect the green wire from the ground screw and connect a continuity tester to the green wire and to the neutral terminal. It will light up!