Theory:Doctor Who television discontinuity and plot holes/The Keeper of Traken


 * Why doesn't the Keeper take the very simple precaution of advising his councellors that he has invited the Doctor to Traken long before he arrives?
 * It is unclear how much time intervened. The opportunity may not have arisen.


 * What has the Master been doing inside his TARDIS for all those years while Kassia grew up? Does he really have that kind of time to spare in his condition?
 * It's a time machine. He is able to make it appear as though Melkur has been waiting in the garden that long when really, for the Master, a much shorter time has elapsed.


 * How could the Master be in the same incarnation but look a bit different?
 * His condition was partially improved when he was exposed to the Eye of Harmony at the end of The Deadly Assassin, hence his slightly different appearance.