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?
 * Maybe they did. The thrusters could be on an even lower level, so the time dilation would be much greater (it's exponential). Besides, with a gravity pull much stronger on the "bottom" of the ship, I'm surprised they ever got the elevators working. Perhaps that feat by itself needed a few years of R&D to achieve. That's just my theory, since we're ignoring the "elephant in the room". It could all be a part of Master's (Missy's) plan, so I wouldn't delve too much into this until the next episode.