Theory:Doctor Who television discontinuity and plot holes/City of Death


 * It's very unlikely a Human could withstand the earth's atmosphere 400 million years ago, yet Duggan, the Doctor or Romana do have a problem standing outside at that time.
 * Duggan, maybe, but the Doctor and Romana being Time Lords likely could. Another possibility is that the TARDIS was protecting them as well.


 * How does the Doctor twice manage to direct the TARDIS to a specific point when the randomiser is installed?
 * The sentience of the TARDIS has been long established, too, so it might have known to bypass the randomizer.
 * The Doctor does have the capability to bypass the randomiser if he chooses to do so.


 * If the Countess has managed to go her entire married life without discovering that her husband is really a cycloptic, green-tentacled alien then either his skin suit is incredibly sophisticated to hold up to such intimate scrutiny, or their marriage is unconsummated.
 * Both are possibilities. It was only ever a marriage of convenience, and some aliens [including the Slitheen] have been seen to possess the ability to use "fully functional" human bodies as disguises.


 * Life had already started 400 million years ago.
 * In episode four Romana wires up a British three pin plug in order to connect Scaroth's time equipment to the (French) mains.


 * In episode one, the wrist of Scaroth's monster glove flaps about.*The sketch of Romana is different when it's seen outside the café from the one seen inside (and just who's doing the sketch, and why?)


 * The chances of there being solid land for them to stand on Four hundered million years ago are very unlikely.