1. The original title sequence from 1963 kicked off the episode.
2. Totter's Lane, where the First Doctor parked his TARDIS while his granddaughter Susan Foreman was at school, got a lovely wink at the opening of the episode.
3. And here's Coal Hill School itself, where companions Ian Chesterton and Barbara Wright taught. Look closely...
4. And we got a lovely little homage to TARDISes past via "the round things."
5. Although did you catch them again here, with Tom Baker himself?
9. The Doctor's phone number has stayed the same since Season 4's "Stolen Earth," at least.
11. The Eleventh Doctor actually carves the date and time of the first-ever episode of Doctor Who into the tower's wall.
12. And Clara drives past a clock displaying the time the first episode aired once more.
13. Clara's whiteboard at the start of the episode already had "no more" written on it.
14. The fez was, of course, quite present.
15. And these glasses sure do look familiar.
17. River's shoes are apparently a weapon of mass destruction worth keeping in the Black Vaults.
Not that this is actually surprising, come to think of it. Via.
20. Many of the Doctor's faces and Companions are visible on Kate's board.
23. The polarity got reversed.
25. Bummed you didn't get to see Hurt regenerate into Eccleston? Fans believe if you look closely at Hurt's right eye in this scene, it actually does morph into Eccleston's.
When the flames start to cover his eye, watch the eyebrow. Something definitely shifts.
26. The time line of this episode ties in wonderfully to season one's whole "Bad Wolf" arc.
27. Tom Baker's surprise cameo as "The Curator" basically broke the fandom.
28. As if we weren't already done in by Capaldi's eyes alone.
29. Speaking of, Capaldi is starting to make a wonderful amount of sense...
30. And if you watched The Five(ish) Doctors Reboot (which you should), you may recognize the shrouded Zygons as none other than a few of the other classic Doctors.
Maybe. It's not been confirmed, but it's fun to think that may be a vaguely disgruntled Peter Davidson under there. Via.
31. The Face of Boe's cryptic words from Season 3 were given an extra layer of meaning.
32. Basically it was all very (everyone say it together now) timey-wimey.
33. FUN FACT: Osgood, aka "Scarf Girl," may be a nod to Tom Osgood, a U.N.I.T. technician who served under the Brig.
34. And this move is directly out of the Fourth Doctor's book.
35. These were pretty much the greatest credits ever and we're still hyperventilating about it.
Cheers to another 50 years, Doctor Who!
