Theory:Doctor Who television discontinuity and plot holes/Revolution of the Daleks


 * There's a chance this may be more a production error but; when the Doctor notices Jack in the penn next to her, she runs over to him and clearly puts her hands on the electrified bars without being zapped.
 * How did no one on Earth seem to have heard of a Dalek, even though the Earth was invaded by the Daleks in The Stolen Earth (TV story)?
 * Those events were erased when the universe reset in The Big Bang (TV story).
 * They were erased by the cracks in time, but the purpose of the universe being reset was to restore everything they erased, like Amy's parents for example. The Daelk invasions would have been restored. It seems like a poor excuse for bad continuity.