Theory:Doctor Who television discontinuity and plot holes/Resolution


 * Why does no one seem to remember the Dalek invasions of 2007 and 2009? (Doomsday (TV story), The Stolen Earth (TV story))
 * Bluntly, just lazy looking after of previous continuity.


 * In series 5, the Doctor was surprised Amy couldn't remember the 2009 Dalek invasion. It was revealed later on that the cracks in time had erased the RTD-era invasions (and possibly some classic ones). This is why it wasn't common knowledge in the Moffat-era that aliens existed and why Graham didn't believe they did in The Woman Who Fell to Earth.

Those events were not permantenly removed from the timeline. What did captain Brooke do then? How did Davros have footage of that event? And why is Rory suddenly back but these events aren’t? Cracks didn’t wipe it for good. It’s an assumption that made the writers wrongly not get pulled up for their bad connections.