History Fridge / DoctorWhoClassicSeries

* A one-off joke in "[[Recap/DoctorWhoS3E10TheWarMachines The War Machines]]" becomes a bit of Fridge Brilliance thanks to modern ''Doctor Who.'' At the start of that serial, the TARDIS arrives in the sixties and the Doctor places an Out of Order sign on the TARDIS to, as he explains to Dodo, prevent anyone from trying to use it as an actual police box. Indeed, exactly that happens as a FunnyBackgroundEvent as the Doctor is saying this. What turns this into Fridge Brilliance is modern ''Who's'' introduction of the Perception Filter, which makes people not notice an object's presence. They've consistently been shown to stop working once someone is aware of it, and to rely on the fact that no one is actively looking for the filtered object in the first place. Obviously, it doesn't come up here because this is decades before the idea ever came about, but at the same time, would a perception filter have even ''worked'' in this instance? Police boxes were a fact of life in 1960's London. Were they needed, people such as that policeman ''would'' be actively looking for it, possibly allowing them to spot the TARDIS, filter or not. The Out of Order sign suddenly becomes a sign of GenreSavvy from the Doctor rather than just a simple gag.

** Even more FridgeHorror from that same serial-- [[spoiler:both factions of ]]Daleks have been in the area for quite some time -- how many people were made slaves to the Daleks, like the little girl and the teacher from the school? How many people were simply killed outright because they were unlucky enough to cross paths with a Dalek? Also? The area wasn't evacuated until AFTER the first skirmish in the serial, and there are people standing around looking at the commotion when the dead soldiers are discovered. How many civilians got killed when the Daleks started throwing around energy beams? One of the onlookers is a woman with a baby!

* Here's one from the Doctor Who movie ("The Enemy Within"): remember how the Seventh Doctor was begging Grace not to operate? Remember how he "woke up" during surgery? Well, because they have two hearts, Time Lords also have a respiratory bypass system; in other words, any anesthetic you give them isn't going to last very long--[[spoiler: and neither are any painkillers...]]

* It has been stated many times that the Doctor's interference in Genesis of the Daleks started the Time War. But when you think about it, the Doctor is not only to blame for the Time War itself, but also for every other appearence of Daleks not set on Skaro. Remember, before meeting him, the Kaleds believed Skaro to be the only inhabited planet in the universe.

* The Zygons' plan to alter the Earth would have caused the Krynoid pods to germinate with Thete not knowing about it until far too late. And it's the same author--and director--for both stories.

* At the end of "The Visitation", the Doctor and his companions stop to toss all the boxes on the Terileptil's wagon into the Pudding Land fire, to get rid of their dangerous contents. Said contents are ''live rats'': animals which, while they had to be eliminated to avert the Terileptils' unstoppable plague, had never asked to be used as vectors and hardly deserved to be ''burned alive'' as a method of disposal.

* The Trial of a Time Lord ends with the reveal that the Keeper of the Matrix has been replaced by the Valeyard, giving the possibility that the Doctor is still trapped within the matrix, in which case the entirety of the Seventh, Eighth, War, Ninth, Tenth, Eleventh and Twelfth Doctors' tenures are essentially AllJustADream.

* Why would a middle-aged schoolteacher like Ian Chesterton handle fights so well? Given his age, there's a good chance he served in WorldWarII! (If he's the same age as his actor, he turned 18 in 1942). According to the wiki, he was a private in the British Army in 1950, and spent his service in Malaysia. So there's a good chance that he picked up some ''very'' useful skills there.

* In "The Time Monster", Stu retains his 25 year-old consciousness when he gets superaged into an Octogenerian. Which means that Sgt. Benton ''also'' retains his adult consciousness when he gets deaged into a baby! No wonder he won't eat the marmalade sandwiches mashed up in cold tea.

* The presence of the Watcher in "Logopolis" makes a lot more sense if you consider how, in "Planet of the Spiders", Cho Gee turned out to be a mental projection from the Doctor's onetime guru, the Time Lord hermit who'd inspired him as a boy. When the Hermit regenerated in the Third Doctor's final episode, his projected self Cho Gee merged with him to assist the process; by the time the next Doctor died, Four had advanced in his own mental skills to the point where he could use the same technique to facilitate a difficult regeneration, albeit with a lot less artistry (hence, the Watcher ''not'' looking much like Peter Davison).

** Alternately, his ''pulse'' is normal because half his arteries receive blood from one heart, and half from the other. Each artery's pulse would therefore only reflect the heart rate of one of his two hearts, not both.

* In "Genesis of the Daleks", the Doctor starts the Time War.

* The presence of the Watcher in "Logopolis" makes a lot more sense if you consider how, in "Planet of the Spiders", Cho Gee turned out to be a mental projection from the Doctor's onetime guru, the Time Lord hermit who'd inspired him as a boy. When the Hermit regenerated in the Third Doctor's final episode, his projected self Cho Gee merged with him to assist the process; by the time the next Doctor died, Four had advanced in his own mental skills to the point where he could use the same technique to facilitate a difficult regeneration, albeit with a lot less artistry (hence, the Watcher ''not'' looking much like Peter Davidson).

* The Trial of a Time Lord ends with the reveal that the Keeper of the Matrix has been replaced by the Valeyard, giving the possibility that the Doctor is still trapped within the matrix, in which case the entirety of the Seventh, Eighth, War, Ninth, Tenth, Eleventh and Twelfth Doctors' tenures are essentially AllJustADream.