Theory:Doctor Who television discontinuity and plot holes/World Enough and Time


 * Mr. Razor mentions "an expedition to floor 507, the largest of the solar farms." A solar farm generates electricity from sunlight.  Light inside a ship would take power to generate in the first place.  Collecting it to generate power does not make sense.
 * He was revealed to be the Master, perhaps he was lying for a good story.
 * The episode opening reveals that there are levels that appear to have artificial sunlight. Plus there are windows to the outside shown.


 * Why is Bill not just instantly converted like the rest of the patients are? Why is she spared that fate for years?
 * The episode makes clear that Bill needed to be strong before undergoing the procedure, which took time. It's also made clear that the Master waited until the Doctor and Missy were in the elevator before arranging for her to be converted.


 * What exactly does Missy's umbrella do? No way she threatens people with it for show.
 * This will probably be revealed later. This being Missy it could be a ray gun.


 * Why didn't the original crew just return straight up after they adjusted the thrusters? Why stay down there and let themselves devolve to the way their descendants are generations on?