Theory:Doctor Who television discontinuity and plot holes/The Creature from the Pit


 * Wrapping a sheet of aluminium around the neutron star would not have the effect of reducing its gravitational pull, but rather, would increase it.
 * The sheet of aluminium merely enables the Doctor to get a better lock on it with his tractor beam.


 * Nobody's lips move when they are connected to Erato's vocalizer sheild. Using someone else to speak for you would require that you could control their mouth and lips as well as their larynx in order to form intelligible words and speech.
 * The device is more complicated than simply controlling the relevant body parts. It may well take the vocalizations from the larynx and "clean them up".