The Space Shuttle in the film is referred to both as "Atlantis" and by the fictional name "Explorer". The name "Atlantis" is just barely legible in the opening stock footage of the launch.
Characters variously state that the militia members removed either two or three security guards from the courthouse before it exploded.
There is no indication of Pierson informing the authorities that Sheriff Weston and Catherine "The Cat" were working with the Diamondbacks, even though he was aware of the involvement of both.