Fine.
With the Second Doctor regeneration, I just thought it'd be cool to showcase the actual morph from Troughton to Pertwee, while also utilizing the Devious fan-vid footage. In retrospect, it might've been a better idea if I had the Second Doctor (actually the Doctor 2.5 in the fanvid) be covered with regeneration glow and all that, but as is, I like to view as a minisode inbetween War Games and Spearhead from Space.
The second vid is just my idea of how to fit A Girl's Best Friend, the pilot to K9 And Company, the series that never was, into the Doctor Who canon. And I used the Tom Baker opening/closing of the '80's, seeing as how the episode was clearly made in that decade, too. In my mind, this is the Christmas special prior to The Leisure Hive, and it slyly but surely sets the mood for the new decade. As well as hint at the Five Doctor with a tantilizingly never-resolved (until 1983) cliffhanger.
For the First Doctor, I just simply wanted to change the First Doctor's last words to something far closer to what he had actually said, instead of retrofitting Moffat's Day of the Doctor line to him, and it was rather fortunate that Bradley had a take of that other line I used, too. I also added one more shot of Ben-Polly in the TARDIS, and experimented with the idea that the First Doctor be shown in color because, why not.
Finally, I wanted to view The Deadly Assassin via Geoffrey Beevers. I just like the idea of him being the definitive scared Master, and the fact he read the novelization of the episode in an audiobook, and even more so that he read his lines perfectly in-character, gave me ample opportunity to work on it the way I wanted to. While I get the affection and affectation towards Pratt and his take, for me Beevers is superior, in even the dullest of plays. He owns it almost the same way as Delgado had in his day.