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?
 * How is the Cyberman able to function without a head inside his "helmet"?
 * How is a Roman Gladius able to penetrate a Cybermans armor when 21st century firearms cannot?
 * It was very rusty and already very damaged
 * 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 form 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?