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* Although the concept of the [[Heisenberg's uncertainty principle]] is used here, a proper distinction needs to be made between its depiction in the real world and its depiction in the story. In the real world, the principle typically refers to non-relativistic [[Quantum physics|Quantum Mechanics]], in which time is usually treated as merely a type of parameter rather than an observable. It also has a somewhat analogous uncertainty relation, usually dubbed the "Time-energy uncertainty relation".<ref>https://en.wikipedia.org/wiki/Uncertainty_principle#Examples</ref><ref>https://plato.stanford.edu/entries/qt-uncertainty/</ref> Note that this uncertainty relation is different to the one Heisenberg formulated, although they are related. This is different yet again in Relativistic Quantum Mechanics and Quantum Field Theory. In the context of the story, it is only used as an analogy to explain why the TARDIS over-shoots its destinations a lot. It should not be taken literally. | * Although the concept of the [[Heisenberg's uncertainty principle]] is used here, a proper distinction needs to be made between its depiction in the real world and its depiction in the story. In the real world, the principle typically refers to non-relativistic [[Quantum physics|Quantum Mechanics]], in which time is usually treated as merely a type of parameter rather than an observable. It also has a somewhat analogous uncertainty relation, usually dubbed the "Time-energy uncertainty relation".<ref>https://en.wikipedia.org/wiki/Uncertainty_principle#Examples</ref><ref>https://plato.stanford.edu/entries/qt-uncertainty/</ref> Note that this uncertainty relation is different to the one Heisenberg formulated, although they are related. This is different yet again in Relativistic Quantum Mechanics and Quantum Field Theory. In the context of the story, it is only used as an analogy to explain why the TARDIS over-shoots its destinations a lot. It should not be taken literally. | ||
* The Doctor explains that certain events in time can become [[fixed points in time]] if they are observed, however, if they are not observed they can potentially be changed. The Doctor wasn't sure whether he was dead or alive while inside Leanne's head and so claimed that they couldn't see his body to check whether he was dead or alive, lest he really be dead and they create a fixed point in time. He refers to the situation as a "Schrodinger's ghost", a reference to the famous Quantum Mechanics thought experiment [[Schrödinger's cat|Schrodinger's cat]]. | * The Doctor explains that certain events in time can become [[fixed points in time]] if they are observed, however, if they are not observed they can potentially be changed. The Doctor wasn't sure whether he was dead or alive while inside Leanne's head and so claimed that they couldn't see his body to check whether he was dead or alive, lest he really be dead and they create a fixed point in time. He refers to the situation as a "Schrodinger's ghost", a reference to the famous Quantum Mechanics thought experiment [[Schrödinger's cat|Schrodinger's cat]]. | ||
* Tegan mentioning a [[Peter Cushing]] film is actually a | * Tegan mentioning a [[Peter Cushing]] film is actually a metafictional reference to the films {{cs|Dr. Who and the Daleks (theatrical film)}} and {{cs|Daleks' Invasion Earth 2150 A.D. (theatrical film)}}, where Cushing portrayed the mysterious [[Dr. Who (Dr. Who and the Daleks)|Dr. Who]]. | ||
* The Doctor asks rhetorically that if Leanne does "ghost walks" for a living, why would she not want to mention she has an actual ghost in her head? "Ghost Walk" is, of course, the title of the story. | * The Doctor asks rhetorically that if Leanne does "ghost walks" for a living, why would she not want to mention she has an actual ghost in her head? "Ghost Walk" is, of course, the title of the story. | ||
* [[Sacha Dhawan]], who voices the characters Reverend Matthew Doyles and Katya's boyfriend, would later go on to play the [[The Master|Master]] in [[2020]] for [[Series 12]] opposite [[Jodie Whittaker]] as the [[Thirteenth Doctor]]. Interestingly, this audio contains more than one actor to have appeared in some capacity on the show (besides the main cast) as [[Fenella Woolgar]] voices the central character Leanne and had previously played [[Agatha Christie]] in [[TV]]: ''[[The Unicorn and the Wasp (TV story)|The Unicorn and the Wasp]]''. In fact three people from Ghost Walk would later be in the same TV episode The Power of the Doctor that of Peter Davison, Janet Fielding and Sacha Dhawan. With Dhawan playing the Master, only Davison and FIelding plays the same characters that they had played in Ghost Walk. | * [[Sacha Dhawan]], who voices the characters Reverend Matthew Doyles and Katya's boyfriend, would later go on to play the [[The Master|Master]] in [[2020]] for [[Series 12]] opposite [[Jodie Whittaker]] as the [[Thirteenth Doctor]]. Interestingly, this audio contains more than one actor to have appeared in some capacity on the show (besides the main cast) as [[Fenella Woolgar]] voices the central character Leanne and had previously played [[Agatha Christie]] in [[TV]]: ''[[The Unicorn and the Wasp (TV story)|The Unicorn and the Wasp]]''. In fact three people from Ghost Walk would later be in the same TV episode The Power of the Doctor that of Peter Davison, Janet Fielding and Sacha Dhawan. With Dhawan playing the Master, only Davison and FIelding plays the same characters that they had played in Ghost Walk. | ||
