In these times when high definition resolution, background information, and behind-the-scenes videos released on YouTube are available to the general public, we can learn what really went on during particular scenes that can't be known just by watching the scene in question.
A case in point:
During "Human Nature" the first half of a two-part 'Doctor Who' story, Dr. Martha Jones watched a recording of the Doctor for information about what to do in an emergency while he was "unavailable". (You'll have to watch the episode to understand what happened to him.)
At one point, not finding the pertinent info, she scrolled ahead to reach the relevant remarks. All well and good, we've seen that type of scene before in other TV series, even the more mundane shows.
But now we can find out what it was the Doctor was yammering on about during that sequence....
It puts me in mind of a similar situation when Ward Cleaver had to read a letter sent home by Beaver's teacher in an episode of 'Leave It To Beaver'. Thanks to high-def resolution to the video, we now know what that letter really said, no matter what Ward claimed......