Theory:Doctor Who television discontinuity and plot holes/The End of the World


 * Why would Cassandra call herself a little boy while it is easy to notify her as female?
 * Perhaps she got a sex change and became Cassandra. Also, Cassandra had already made several false statements about the past, such as mistaking a jukebox for an iPod, and stating that an ostrich could breathe fire and had a wingspan of fifty feet.
 * In the companion book Doctor Who: Monsters and Villains, an extract from a book by Vox B. Macmillan heavily implies that Cassandra was once known as Mr B. E. Cobbs.


 * What happened to the mega-cities and patches of fire seen in The Long Game, Bad Wolf and The Parting of the Ways?
 * This is the year 5 billion. A lot of time has passed since 200,100. Furthermore, Earth was preserved in a classic state. This probably does not include mega-cities.


 * Why does the air conditioning system return to normal once the Earth is destroyed? Surely the heat is still there?
 * The Earth could easily be absorbing and, in turn, radiating heat from the Sun.


 * How would tiny robotic spiders have the physical strength to drag a humanoid into a ventilation shaft