Theory:Doctor Who television discontinuity and plot holes/Attack of the Graske


 * If the TARDIS is following the Graske's trail, then how can it arrive before him?
 * It follows his trail to the right timezone and then has to wait around until he materialises.


 * The map of Victorian London looks more like a map of modern London.
 * Victorian London and modern London are not that different in mapping terms.


 * If the Graske want to conquer Earth by replacing its population then why does the Graske we see replace a modern day person and then travel back in time to replace a Victorian person? Why not just try to conquer Earth in one era rather than two eras?
 * There were less people in Victorian times, so would be less people to replace.


 * How does the Doctor know that the Raxicoricofallapatorian is from the Slitheen family?
 * Different families may have different skin colours. The Slitheen are shown to be green, Blathereens to be orange and Slitheen-Blathereens to be a brown-reddish colour.
 * It is unlikely that only one family in the whole of Raxacoricofallapatorius has green skin. That is like saying only one family in the whole Earth is white or black.
 * Families on Raxicoricofallapatorius may mean the same thing as race does on Earth.