Theory:Doctor Who television discontinuity and plot holes/The Pandorica Opens


 * 5145 is not in the 51st century.
 * While scanning Stonehenge, how did River Song miss the Cyberman head?
 * The head was shown to be able to move.


 * How is the Cyberman able to function without a head inside his "helmet"?
 * The Doctor explained that it was the robotics taking over to find a new head.


 * How is a Roman Gladius able to penetrate a Cyberman's armour when 21st century firearms cannot?
 * It was very rusty and already very damaged.
 * It was not Roman but Auton in nature, so it may have had greater strength.


 * If the trap involving Romans, Pandorica and Stonehenge was built from Amy Ponds memories, why are there pieces of Cyberman scattered around?


 * They were guarding the place from the Cybermens point of view, the trap was organised by the alliance and the Cybermen were acting as sentry.


 * How can there be a photo of Rory with Amy in the present if he was erased from time?
 * The Doctor explained that certain things still lived on. He even mentioned a face in a photograph.