Theory:Doctor Who television discontinuity and plot holes/A Good Man Goes to War


 * If River is Amy and Rory's daughter, why wasn't she erased along with Rory when he died in Cold Blood?
 * Simple. When Amy's parents were erased from time, Amy continued to exist. Therefore, when Rory was erased from time, River continued to exist.


 * Why would the Cybermen have safety signs on their ship? There's clearly a "Fire Escape" sign and another denoting the contents of the tanks in the background while the Cyber Leader calls out intruders.
 * Perhaps they stole the ships?
 * They were clearly the same Cyber Ships portrayed in the Series 5 Finale.
 * So, that doesn't mean they didn't steal them.
 * They are also similar to the ships in The Invasion. Also, Cybermen aren't indestructible, they would likely need safety guidelines as well.


 * Why hasn't the Doctor ever assembled an army before now and why didn't he bring more of his assistants to help instead of old enemies like a Sontaran.
 * Clearly he never saw the need before, and they are all people who owe him favours, he proberly doesn't want to interupt his old friends new lives.
 * For all we know the Doctor may have done something similar to this before, but off-screen.
 * Although Sontarans are normally his enemy, Strax wasn't.