When the RBS newsroom transfers to their reporter Megan Barclay in Charleston, she begins her report saying; "The situation began approximately 1 hour ago". The report then screens some video from their reporting team and then shows some Super-8 footage which was filmed by a tourist on a sightseeing boat. Super-8 is a film, not video, format. Normally the cost of the film cartridge included postage to a Kodak laboratory where it would be developed and then mailed back to the owner. In this instance, After the boat had reached shore, it would have been necessary to take the film to a Kodak developing facility to be processed, after which it could be taken to the news studio. Due to the time required to get the film to a laboratory for processing and then to get to the news studio it would have been impossible to do this within the time allowed.
We see the bomb detonate from a security camera in the room it's in. The cam goes into "video feedback" for about one second as it melts, then goes blank. In reality, the camera, the room, and the building would be vaporized in far less than the 1/30th of a second required to transmit even a single video frame of the explosion.
The bomb goes off and the screen goes to static. In actuality, the countdown clock (still counting down) and the lower third box would still be on the screen (the lower third box would have static though,) as it is coming from the network's control room (in New York) instead of Charleston, and would not have been affected by the blast.