Factual error: The Presidential helicopter(s) is only called Marine One, when the President is on board. Like Airforce One - there are several aircraft of the same type, but the code name is only applied to the one carrying the President.
Factual error: When Garrison takes a phone call at the Mayflower, the person on the other end tells him to "walk 3 blocks east on Massachusetts Ave., take a left on 12th Street, Las Palmas coffee shop." The Mayflower is at Connecticut Ave. & L Street, about 6 blocks directly west of Massachusetts & 12th. Massachusetts Ave., which runs diagonally, does not form a logical route between the two locations. (00:34:45)
Factual error: When Marine One is shot down, it is depicted flying alone. In reality, Marine One always flies in an air motorcade, to prevent exactly what happens in the film.
Factual error: The President goes to the G8 summit in Toronto at the end. The G8 is comprised of Canada, United States, Britain, France, Italy, Japan, Germany and Russia. In the room there are a number of non-G8 countries represented.
Factual error: At the very end of the film, the camera zooms out from the White House revealing the Washington Monument behind it, however in reality, the monument would be to the viewers left of the White House and would not be viable in this shot.
Chosen answer: Sometimes. A suppressor, known commonly as a silencer, works by reducing the sound of firing by manipulating the escaping propellant gas, and sometimes by reducing the velocity of the bullet. It all depends on the type of suppressor that is used.
Jazetopher