Theory:Doctor Who television discontinuity and plot holes/Bad Wolf


 * The station is masking the Dalek fleet from sonar, which is entirely useless in space as a vacuum cannot transmit sound.
 * Maybe a way to transmit sonar through space has been discovered. Also, sound can travel through space as it is not a perfect vacuum.
 * Sonar, being an acronym, could stand for some other means of detection in this time period such as Space Omnidirectional Navigation And Ranging.


 * The Doctor states that the Jagrafess was installed a hundred years ago, when it was actually installed 190 years ago.
 * The Doctor may have been referring to the fact the Jagrafess was there 100 years ago, not that that was when it was first put in.


 * If no one has a garden, why is there a Groundforce show?
 * Because it was a show about turning people into compost more than actual gardening.
 * The statement "no one has a garden" could just mean no normal people and just very few rich people have one. Given the Doctor's plain clothes, it would not be wrong for Lynda to think the Doctor was not rich.


 * The Doctor states that the Daleks have only two emotions hate and fear, but in the past they have shown more than those.
 * From fear and hate many different emotions can be created, though not as strong as the original ones. Hatred of something generally also brings the feeling of anger about it.


 * The Doctor said there were 200 Dalek ships and 2000 Daleks in each meaning there are 500,000 Daleks in total. But 200 multiplied by 2000 is only 400,000.
 * There are 200 normal ships and the Emperor's ship. So there are 400,000 Daleks overall on the 200 ships and the Mother ship which is much bigger contains 100,000 Daleks.
 * The Doctor mentions there are "more than 2000 on board each one" and that there are "just about half a million of them", mean less than 500,000. Also, it is unlikely that every ship has precisely 2,000 Daleks on board.