The majority of the actors in the film were not told the premise of the movie. The working title for the film was "D.O.A.P.," and the actors were not told what the plot was, except for their specific scenes.
The footage used from Dick Cheney's eulogy for Bush was actually edited footage from his eulogy at the funeral of former President Ronald Reagan in 2004.
Preexisting footage of President George W. Bush and CGI effects help to create the scenes of his assassination.
The rifle used by the murderer was actually an airsoft replica (G&G SR25) of a AR15.