I was just watching the "Adventure in Time and Space" special (that doco-drama of the start of DrWho in 1963), and it was quite fascinating. Well worth the watch if a fan of DrWho and wanted to see how it all began... with a bumpy start that almost ended after just the first story.
It was nice to see how they made some of the special effects noises, like the Tardis materialising noise and the opening credits visuals.
The accuracy of something that happened 50 years ago is questionable, especially since most of the people involved are now dead... but if true, it was nice to see that William Hartnell had a respect for the audience - noting that he had to be consistent with how he did things (like where the door lever was on the Tardis console) because the kids watching would pick up on any contradictions. (like in any fandom)
Despite being a grumpy old man, it's possible (from that doco-drama) that he was invested into the show and its fiction to make sure it worked.


I came across this earlier in the year, which might be repetitious to some, but fascinating to watch and listen to - all the different opening themes, showing the evolution of the opening credits and music over the 50-ish years.
It's surprising to see that the signature riff/tune is the same since 1963, but just recorded in different ways over the 50 years. Even Star Trek didn't keep their signature tune, over their almost-50 years... and that's probably the next longest lasting TV/movie universe.

And for anyone really keen, the second part has themes from spinoffs and specials.
They are official, so looks to be taken off some special release DVD from the BBC.

This other video by the same youtube user appears to be done by that person (not an official video), which is an anthology of the regenerations (up until 2010)... which is likely to be updated soon with the three new regenerations shown this year. (and it noted a regeneration from McGann to Eccelston, which we now know doesn't happen)


While I'm at it, for anyone who wants to immerse themselves into some fringe "non/conjectural canon" of DrWho, here are some short videos I recommend....

The Curse of the Fatal Death (1999 charity special) - Rowen Atkinson leads several stars playing several incarnations of the Doctor. (including Richard E Grant, who also featured in a 40th Anniversary animation as the Doctor, but was also in the 50th Anniversary season as the as the puppet of the Great Intelligence)
Dimensions in Time (30th Anniversary charity special) - The Rani is trying to capture the various Doctors, featuring Pertwee(3), Baker (4), Davison (5), Baker (6), McCoy (7) and several various companions from just about every Doctor. Plus some outtakes and edits posted on youtube by one of the writers.
Time Crash (2008 charity special) - David Tennant meets Peter Davidson as Doctors (they probably meet in real life quite often, since they are related - Tennant married Davison's daughter three years after she played the Doctor's Daughter in the series)
2007 charity special - David Tennant and Catherine Tate (Donna) in a classroom as teacher and student (respectively).
2005 charity special - an extended version of David Tennant's introduction as the new Doctor... explaining how Rose seemed so quick to accept him before the next episode, and why they weren't in Barcelona, or why the Doctor was having side effects to the regeneration in the Christmas Invasion.
1985 charity special - Doctors 2, 3, 5 & 6 and about 12 companions presenting donation cheques to the charity.

How about some outtakes to finish things off?