Theory:Doctor Who television discontinuity and plot holes/The Runaway Bride


 * The Empress says the Roboforms are 'such very good shots' but after the TARDIS materializes, they miss it by a considerable amount.
 * The TARDIS has defences of unknown type, which could certainly handle deflecting the bullets. The Roboforms have also been seen to miss their shot before, meaning the Empress may have overstated the quality of their marksmanship.
 * Well, the TARDIS has been shown not to defend against Dalek guns (Victory of the Daleks), bullets (Doctor Who), arrows (The Shakespeare Code), or even graffiti artists (Aliens of London). There has rarely been any kind of special protective field exhibited by the TARDIS, except when specifically "switched on", as during The Parting of the Ways.  Thus, there is actually no good reason for the Roboform's targeting ineptitude here.
 * None of those weapons penetrated the TARDIS at those times. As for the defences, we know it has them, we just don't really have any clue what they are, if they work properly (very few systems in the TARDIS *do* seem to work consistently), or when they have been switched on/off.


 * It takes an amazingly short amount of time for the waters of the Thames to journey to the centre of the earth and drown the children of Racnoss. And why doesn't the heat of the Earth's mantle evaporate it?
 * The Racnoss children aren't at the centre, they already began their ascent.


 * The Doctor says the TARDIS could take a couple of hours to heal itself, but the Doctor and Donna come back inside after their conversation which was nothing close to an hour.
 * Nothing suggests that they went back to the TARDIS, they could have walked or taken a taxi. We didn't see the TARDIS in between when they went to the reception and when the Doctor summoned it.


 * The Queen of the Racnoss is supposed to lay eggs which produce new Racnoss, so why doesn't she just lay some new eggs? She also doesn't seem to have any from the time before the Racnoss were destroyed.
 * Wouldn't she need a male of her species to do that?


 * Sylvia says her phone has run out of battery however later on she was able to see Donna's message she left her.
 * Many phones can remain on (or be turned back on) with very low battery, but can't make or receive calls in that state. A phone call takes about 5 times as much power as running without a connection even on a high-powered smartphone, and it can be as much as 500 times as much on simpler phones.