A movie of two halves.
It seemed that this film was almost like two different films about the same subject, with the same actors, because the style of the film in the first half and the second half seems different.
In the first half, it is the same incident played from different people's point of views ("vantage points"). It reminded me a bit of Memento, where it would flash backwards.
Then the second part of the film dropped the "vantage point" part completely and became another car chase film. Not complaining, as it is one of the best car chases I have seen in a movie (the car chase in F & F 5, with the bank safe, is still the best). But it seemed like they ran out of ideas for the "vantage point" part and dropped it.
I actually thought that it was about a political assasination, and the people who viewed it. It has been said that, when people witness something, everyone's recollection is slightly different, depending on what they were focused on at the time.
I think it would have been interesting if they were trying to piece together who is the culprit, by what each person saw. Dennis Quaid saw someone in the window, and missed the assassination, for example, and Forest Whittaker's vantage point is watching through a video camera, as opposed to some else who is looking at it, unhindered. I think the different "vatage points" could have been pieced together, like a murder mystery, to find who is responsible. It could have made for a very interesting film.