Theory:Doctor Who television discontinuity and plot holes/The Web of Fear


 * Where do all the other robot Yeti come from? Surely Travers could not have brought them all back from Tibet. If think we assume that they were built from scratch under instruction from the Great Intelligence, by the first Yeti or the possessed Arnold, then why bother to disguise them as Yeti at all? Surely they were only originally made to look like Yeti to exploit the folklore of Tibet for purposes of cover, but in 1960's London that would be almost totally redundant.
 * They were built following a basic simple design, and to create fear in order to once again allow them to operate with minimal human interference.


 * When talking about underground trains the Doctor tells Victoria they came a little after her time but she is from 1866 and an underground train line opened in 1863.
 * He was mistaken, it must be difficult remembering all of human history.


 * The Yeti changes shape in the museum scene (not intentional, surely?).
 * It certainly seems to be intentional, with a deliberate cross fade between the Yeti's two forms. The Yeti were redesigned between their first story and this one, and the change was shown by having the one in the museum "morph" into the new form after being reactivated.


 * When Jamie and the others are looking at the scanner in the first episode, Frazer Hines rests his hand on the console but withdraws it quickly as if he's burnt it.
 * The TARDIS console contains a lot of energy, it could very well have been hot at that point.


 * The 'explosion' at the end of episode one happens several times.
 * It only appears that way. The secondary glowing is merely a side effect of the web absorbing the energy of the blast. (This is confirmed in episode two, when dialogue describes another absorbed explosion as "pulsating".)