Basically he explains how the staging works, then goes through the footage pointing out what could have gone wrong (one or two vents not open, sensor failure, pyro failures), where you can see it (location and rotation rates of the boosters, lack of gas cloud, etc), basically what would various failure modes look like.
Then he continues doing the same about the escape system and which parts of it worked (tower jettisoned, shroud used).
Then he talks about ISS logistics (Progress is cancelled too), crew changes (trying to avoid the unmanned state at all costs), Soyuz endurance (H2O2 expiration), etc, and how that gets affected.
And after all that he closes with a request to wait for the investigation and avoid making guesses. :/