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.
 * Trapped within a bubble of accelerated time, without food and water, the chicken should just die before it has a chance to mature. Kerensky would not have time to reach old age before dehydration set in, either.
 * Scaroth's device to refract the security lasers causes them to bend into the wall. Since this would still result in breaking the beam, it would set the alarm off as surely as sticking a hand between them.