Theory:Doctor Who television discontinuity and plot holes/Thin Ice


 * Bill claims she has never seen a person die before, yet she was present when the Vardy killed one of the human settlers in the previous episode (a few hours ago in the show's continuity).
 * It probably happened too fast to really register with her as a death. Plus Spider was a child so it's understandable that she would she be particularly upset about it.


 * How did the fish pass through London Bridge (which was the old bridge with narrow arches) without damaging it?
 * Maybe the fish very flexible and can squeeze its way through the arches.


 * It is stated that the waste from the creature (poop) is more efficient that coal. Sutcliffe decides to blow up the ice using the poop. But, coal is not an explosive!
 * It is more efficient than coal, nobody said that it was coal.   The waste could be very explosive.


 * What has become of the fish since its appearance in 1814?
 * We don't know. This is not a discontinuity.


 * The very first shot, with the elephant, is vastly different from the shot at the end of TV: Smile - it is now snowing much heavier than before, and the whole fair had magically appeared in the background.
 * Watch some episodes from the Hartnell era - this used to happen all the time.

I think we can simply assume that a few minutes pass between the end of Smile and the beginning of Thin Ice.