The series has gone out of it's way not to produce fanwanky nonsense based on the past of the original series.
You're kidding, me, right???
Oh dear Lord, please tell me you're kidding.
Let's see... Daleks & Davros, Cybermen and The Master; all known by the general audience (or their parents). Ditto K9 and Sarah-Jane and UNIT. The Sontarans less so but they were filling the "militeristic alien race" role that could have gone to an original creation with very few changes. The Autons might have counted if they had been anything other than window dressing (pun intended) to the real focus of the episode.
The closest the series has ever got was the Macra and they take up at most a minute or two in the episode.
After that you're down to random lines of dialogue; like referencing 'The Romans' in 'Fires Of Pompeii' or 'The Sensorites' in 'Planet Of The Ood'.
All a far cry from the non-stop deluge of continuity porn claimed in all of these supposed Specials / Series 5 "spoilers".