I didn't get to see this when it aired Friday due to a cable outage, but I just saw it via On Demand. It was a good movie, a good tribute. Bradley was very good as Hartnell; the voice wasn't particularly exact, but he managed to capture the mannerisms pretty well, and gave a moving performance. The cast was very good overall. And the recreation of the period was marvelous. I was glad to see that the console room did have one wall that was just a photo backdrop of the roundels after all, though it was smaller than the real one.
Of course it was a fictionalization, a distillation, rather than a literal, exact recreation of historical events, but anyone who expects strict accuracy from a drama is looking in the wrong place. Juxtaposing Newman reading the script for "The Daleks" with Oswald assassinating Kennedy was chronologically unrealistic, but dramatically very powerful. A lot of this was taking different events and threads and creating composite scenes to summarize things that took place more gradually and diffusely in reality, just as some of the characters, notably Newman and Pinfield, were composites, given credit for multiple people's contributions. But it made it work better as a drama.
One or two of the inaccuracies did bug me a bit, though. The main one was the shot of Delia Derbyshire playing the theme on a keyboard. As I understand it, the theme was created in a musique concrete style by painstakingly splicing together hundreds of strips of audiotape, with every note and every different sound element being a different piece of tape. But then, the saga of the theme's creation probably deserves a movie of its own, so they had to simplify. Still, I wish it had gotten more than a few seconds.
Also, the bit about turning on a switch to make the time rotor rise and fall puzzled me. I always thought that was done manually by a stagehand pushing on a lever or bellows or something. A motor on set would've been too noisy.
And yes, the actress playing Susan did fudge her line and said "Relative Dimensions in Space" instead of "Dimension."
I liked the way Gatiss picked out scenes from the episodes that symbolically resonated with where Hartnell was or where the story was -- from showing the "Danger" warning on the TARDIS console just before the Kennedy sequence to Hartnell stumbling over the Doctor's speech about all his companions leaving. And it was great how the opening flashforward scene with the bobby carried a totally different layer of meaning once we saw it again in context: "You have to move on. You're in the way."
The Smith cameo was a little corny, but it pretty much worked as a symbolic moment. A montage of all the Doctors would've been way too much, and we got plenty of that in "The Day of the Doctor." And Smith is the reigning Doctor as of the 50th anniversary, the event this movie was made to commemorate, so his appearance symbolizes that achievement.