Theory:Doctor Who television discontinuity and plot holes/Invasion of the Dinosaurs

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 * When Sarah says the dinosaurs died out millions of years ago the Doctor replied "63 million years ago to be precise." How is that precise?!
 * The dinosaurs don't 'roar' they just say "roar!".
 * Since no human has in reality ever heard a dinosaur roar, it would be difficult to say what they truly did or did not sound like.


 * If a t-rex did fall over like in episode 3, it would never be able to get back up, and when it does it seems to float.
 * Strong abdominal and side muscles could hypothetically account for the movement. Also, this was before it was known that T-Rex didn't stand upright with its tail dragging.


 * Why send all the dinosaurs when the other humans on board the spaceship are going to a time afterwards?
 * The dinosaurs were to get people out of London so that they would not be protected from the time change.


 * London has been evacuated effectively for sometime before the Doctor and Sarah arrive. What is taking Whitaker so long to begin the final phase of his operation?
 * It takes time for the energy/equipment to build itself up for such a huge time-field to be generated.


 * Also, how would they generate a time-field big enough for the Earth and even if they did, they would have to alter the whole universe as well.
 * No, it is only London that will be inside the field and hence taken back in time to start again on an Earth of the past. Although this does raise the question of how Whitaker and the others were planning to explain to the 'astronauts' what all the buildings and other London landmarks are doing on their strange new world!


 * Dinosaurs may be tough, but bullet-proof is pushing the boundaries of plausibility.
 * The inaccuracies concerning the dinosaurs are legion. To be fair though the prevailing idea about dinosaurs at the time of production was that they were sluggish cold-blooded creatures. The T-rex has three fingers on its arms instead of two. But here again, it was not known for a certainty that T-rex had two fingers until quite recently.
 * In 2007, a Tyrannosaurus rex was unearthed with three fingers on each hand.