The Bad Wolf Entity from "The Parting of the Ways" was responsible for everything saying Bad Wolf
The Bad Wolf Entity was able to scatter the words Bad Wolf throughout time in order to guide the Doctor and Rose to the Game Station. Who's to say that the Bad Wolf Entity couldn't look into the future and see this event, and make the words Bad Wolf appear where the Doctor and Donna were at that point to warn them of the impending danger?- Isn't this canon?
In the "Turn Left" timeline, the Earth was saved because of the Weeping Angels
In "Turn Left", the starship Titanic crashes on the Earth as Max Capricorn planned. He was expecting it to render the planet lifeless, but all it managed was to destroy London and its surroundings.This being the "Turn Left" timeline, the four Angels at Wester Drumlins were still at large, and a crashing starship would be meat and drink to them. They feasted on the fallout, and by the time they'd finished the destruction was a purely local phenomenon. And probably forced their way into Max Capricorn's impregnable impact chamber, too, just to show they could.
UNIT was responsible for saving the day in this reality's version of "The Shakespeare Code", "Daleks in Manhattan" and "The Fires of Pompeii"
They had a time machine, and would presumably use it to ensure the present. Plus it's the only rational explanation as to why very little history prior to the Runaway Bride is different.- No word on "Daleks in Manhattan"/"Evolution of the Daleks", but confirmed by Word of God that UNIT time-travelling commandos stopped the Carrionites and Pyroviles.
There are non-time travel explanations for episodes set in the past.
Well, some of them. Can't figure out how "The Shakespeare Code" would work without some sort of butterfly effect.- "Daleks in Manhattan" and "Evolution of the Daleks": Dalek Sec's plan to make hybrids failed just as hard as in the main timeline, though Thay and Jast survived. The three decided to temporal shift elsewhere, not going into the Time War because Caan didn't think it desperate enough unless there was only one of them left and it was a do or die situation.
- "The Unicorn and the Wasp": Reverend Golighty got away with murder, and Agatha Christie was never missing for ten days.
- "The Fires of Pompeii": Because the Reality Bomb doesn't exist in this timeline, the Pyroviles would have never gotten lost. Besides, the eruption of Mt Vesuvius was a fixed point in time so they were doomed to fail.
- "Blink", "Human Nature"/"The Family of Blood": Because there's no Doctor or TARDIS to trigger those events, they resolved themselves.
- Jossed for "The Fires of Pompeii", as stated above.
The Doctor helped restore the drained River Thames after "The Runaway Bride"
So, in "The Runaway Bride", the Doctor drains the Thames using its water to drown the Racnoss. Half a year later in "Smith and Jones", the river is seen completely back to normal. However, this is not the case in the "Turn Left" timeline. In the episode, Donna is fired from her job as Jeval Chaudhary's personal assistant because his business is suffering because "The Thames is still closed", which news broadcasts reveal is on the same day as the disappearance of the Royal Hope Hospital. Putting this together, London still has not recovered from the Racnoss attack, and the Thames has not recovered from being drained by the Doctor. Since, in the normal timeline, the river does recover within half a year, the most likely cause is that the Doctor did something to help restore the river, adding yet another negative effect of his absence.