Theory:Doctor Who television discontinuity and plot holes/The Chase


 * When they exit the TARDIS on Aridius, you can clearly see it has no backing to it, as the desert set is visible.


 * At the beginning of "The Executioners" Ian seems to know the words to The Beatles' song, "Ticket to Ride". This would seem to be inconsistent, as he left England in 1963 and "Ticket" wasn't released until April 1965.
 * He can only be seen mouthing the words "ticket to ride" at its final utterance, but not the next line "my baby don't care". He simply recognized the group, who was already popular when he left, and only sang along with the last line of the chorus.


 * Later in "The Executioners", Vicki and Ian cast shadows across the backdrop painted like a desert.
 * As the Daleks enter the Time machine, the 5th Dalek 's top flips up.


 * Also in 'The Executioners' the Doctor's inference that the Daleks must be on their way to Aridius at that very moment or 'even worse' that they have already arrived does not follow, as suggested, from the fact that the time/space visualizer can only display events which took place in the past. Since the Daleks are travelling in a time machine they could be aiming to intercept the Doctor at any point in his personal history, i.e. including his own distant future.
 * The Doctor’s conclusion is sound as he is witnessing the Dalek’s departure relative to his own timeline . Since he does not have any recollection of encountering the death squad in his past he knows they can’t be aiming for a point prior to this in his own personal history. But as, from his own standpoint, he is the ‘current’ Doctor, i.e. his own future not having come into existence yet, he can’t be witnessing the Daleks leaving for anywhere else but his own ‘present’. Also the Daleks claim to have located the Tardis on Adrius. As he is unlikely to go there again, he believes they must mean him. He could not, for example, have used the visualizer on Aridius to see the Daleks departing the Marie Celeste or the top of the Empire State Building later in the story, despite them taking place in the past (presuming of course these periods in history were prior in cosmic chronology to the Doctor’s arrival on Aridius) as these are both events which had not happened yet relative to his own timeline.


 * If Frankenstein's monster is just a robot in a funfair then why does it attack the visitors?
 * Notice the place was cancelled. Maybe because the robots were faulty.
 * In EDA: Interference - Book One, it's later established that faulty software (supplied by Microsoft) led to the robots killing people and the whole Festival having to be shut down.


 * How come the robots in the funfair are impervious to Dalek firepower?
 * Their weapons are set to destroy organic tissue only.


 * An Aridian can be seen getting up and sneaking off camera after being knocked over by Vicki. Perhaps it was worried about being hurt again.


 * Whilst moving across the screen in episode 4, a countdown is projected across one of the Daleks.


 * A man's shadow can be seen cast across the TARDIS when it lands in the haunted house.
 * Potentially an intentional "creepy" effect as part of the haunted house.


 * At the top of "Flight Through Eternity" (Episode 3), the Doctor claims to have built the TARDIS. This is clearly at variance with other notions of the TARDIS' origins, such as its having been stolen.(EDA: The Gallifrey Chronicles) and it having been grown (DW: The Impossible Planet).
 * Perhaps the doctor constructed technology that was installed in the TARDIS. They were referring to that.
 * This is not an unusual claim for the Doctor to make. The exact origins of the Doctor, the construction of the TARDIS, and how he came about it, are still shrouded in mystery.


 * At the end of "Flight", its technical flaws are obvious. In the first place, the angle of entry into the water is inconsistent with the casing housing an interior creature. It should have been vertically aligned when it hit the water. Second, contact with the water immediately makes it break apart. This is wholly inconsistent with the general durability Daleks are said to have. And lastly, once the creature breaks in half, its empty interior can clearly be seen.
 * Maybe the water got in to the Dalek's circuits and fried them killing and destroying the creature and made the shell somehow break.


 * In 'Flight Through Eternity' the Doctor explains it takes twelve minutes for the TARDIS's flight computer to re-orientate itself and 'gather power', thus limiting the speed with which they can make each new jump. However, in the same breath, the Doctor states that 'these twelve minutes are vital to us. We must hold on to them.' Here he seems to be treating the twelve minutes they have to wait before they can depart after each landing as if it is a lead of twelve minutes. This attitude is confirmed at the end of the same episode when the Doctor states that their 'lead' is down to eight minutes. This is an inconsistency, unless the Doctor is saying that the amount of time it takes to gather power for the next jump has been reduced.
 * He could be referring to the Daleks' time machine having a similar reorientation time.
 * In later episodes the Tardis can leave quicker. Perhaps it has been improved.


 * If the Daleks are pursuing the TARDIS through the time vortex (i.e. are traveling outside of Space & Time) why when they finally do catch-up, don't the two time machines arrive simultaneously? If the Daleks time ship is capable of going anywhere/anywhen then wouldn't any degree of lag which existed within the vortex cease to exist once they re-entered the time/space continuum?
 * This is yet another instance of the Blinovitch Limitation Effect in action.
 * Furthermore, the Dalek time machine seems to have been specifically engineered to "hitch" rides along the "time tracks" / wormholes created by the TARDIS, and is not ideally suited for independent travel (hence the Doctor's extreme pessimism about allowing Ian and Barbara to make use of it, suggesting they will only have a 50% chance of surviving the trip). Maybe the Daleks have only just started using time travel.


 * As Ian and the Doctor are standing on the stairs in the haunted house a boom mike and operator can be seen clearly in shot.


 * In episode 5, a camera, clearly marked BBC, appears on the Mechanus jungle set.


 * Despite ripping off its bandages Frankenstein's Monster takes the time to change into a jacket between scenes.


 * There are two different Frankenstein's Monster robots in the house; one for the lab and one for the ground floorin the background just before the scene ends.
 * Perhaps the Dalek in question is actually an exhibit in the attraction? It is a house of horrors after all.
 * But this part of the Chase is set in 1996, hardly anyone knew about aliens or Daleks.
 * This Dalek could be the Vanguard waiting for the rest of its taskforce to arrive.


 * The Daleks' "duplicate" of the Doctor actually looks nothing at all like him. A different actor was used for the distance shots, much as a stunt double is used as common practice in films and television. Up close, William Hartnell plays the duplicate also.
 * The android duplicate could have similar properties to Kamelion, shapeshifting into the Doctor's form. However its shapeshifting abilities may not be perfect and sometimes undergoes a subtle change into a form resembling the Doctor but obviously not him.


 * The travellers walk past the Dalek Ship when going to the cave in episode 5 - the Daleks then proceed to pass the cave on there way to find it.
 * They took a different route.


 * The Daleks' weapons proved useless against the horror house robots, yet they were quite effective against the Mechanoids.
 * The Daleks believed the horror house robots to be living creatures, so their weaponry against living tissue of course had no effect. With the Mechanoids, they knew they were dealing with machines.