I very happily found An Adventure in Space and Time
included in the 50th Anniversary package I purchased on iTunes Saturday, and as I watched it, I marveled at all the things I did know (very few) and all the things I didn't (very many) about the origin and creation of Doctor Who as a television series.
By the end, I was quite moved and satisfied by the picture. I can forgive historical inaccuracy; it's a movie, not a documentary.
Lastly, those of you deriding, complaining about or just quizzically unhappy with the Matt Smith cameo are completely missing the point. It was a beautiful moment and I was very happy with it.