Theory:Doctor Who television discontinuity and plot holes/The Witch's Familiar


 * how did Davros get the confession dial? how did it end up in a box along with the sunic-glasses (yes, I just coined a phrase)


 * How did the Doctor a)get control of Davros' chair? b)manage to fit in Davros' chair?


 * The Daleks understood what "mercy" was in their very first chronological story, Genesis of the Daleks (TV story).