The dome can be pulled-off - which then reveals some details inside
The dome can be rotated - but there is no clicking sound - and rotating doesn't trigger any functionality
The antenna on the dome is not removable
The middle leg can be removed
All three feet have rolls in them
There was an accessory variation - the first power harness came with unpainted details on both sides - the second and corrected release had both sides painted (comparison picture: G8-R3)
G8-R3 is an astromech droid on Queen Amidala's starship. The little droid bravely heads into danger to repair the starship's shield generator - which has been badly damaged in an attack by Trade Federation forces.