Theory:Doctor Who television discontinuity and plot holes/The Talons of Weng-Chiang


 * There is more than one giant rat in the sewers, so what happens to the rest of them?
 * The Doctor mentions using cyanide to wipe them out. He probably passes the recommendation on to Litefoot or the police before leaving. On the other hand, why does anything have to happen to the rest of the giant rats? Maybe their descendants are still down there?!


 * Why does Greel need girls rather than young people in general?
 * He is using the Whitechapel murders as cover, hoping that they will simply be blamed on Jack the Ripper without arousing additional suspicion.


 * If Greel is the first human to travel through time, how would he know of Time Agents? ''It's never said that the time agents are human.
 * Since the Time Agents use time travel, Greel could certainly have encountered them even though they are from a later time than when he left.)


 * Leela is placed in the distillation chamber near the end. The Doctor uses an axe to destroy the control. Later on, he shoves Greel into the machine, which sparks and smokes and then works like normal.
 * The axe only causes the machine to malfunction, not break down completely. It is still behaving erratically when Greel is shoved into it.


 * When the Doctor smashes the crystal key on the ground, the deactivated Mr. Sin flinches.
 * Residual energy in his systems flickering with life.


 * The Doctor mentions that he shared a fish caught in the Fleet with the Venerable Bede. But Bede spent his entire life in Jarrow, far removed from London. On the other hand, the Doctor could be putting Litefoot on.
 * The Doctor knows something about the life of Bede which is not recorded in the history books. Further, there are a couple of possible trips that Bede in real life made away from his home monastery, as hinted at in letters he sent. A journey to London is not completely out of the bounds of reality.


 * Litefoot asks the Doctor how does he know the course of the Fleet 'as it has been covered for centuries', although the majority of the river was actually covered in the late 18th and 19th Centuries. In fact, the last section was covered only 20 years before this story is set.


 * When the Doctor and Leela leave the TARDIS, they leave the door partly open. They walk away to the poster of Chiang, then hear the attack on Bullard and run past the TARDIS again. The TARDIS door has magically closed. ::(No magic necessary. It has been well-established that the TARDIS is semi-sentient. It is quite capable of closing its own doors - and opening them, as we later see.)''


 * When Leela is in Greel's laboratory she blinks twice when both Greel and Chang are looking at her. Shouldn't they realize she is not hypnotized?
 * Maybe they did not notice, as it is normal for any human being to blink, and most people does not notice when someone blinks. Also, where does it say hypnotized people don't blink?