Continuity mistake: In the aircraft scenes after the blast in Baltimore, watch the clocks closely. The times go forward, backward, and everything in between.

The Sum of All Fears (2002)
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Directed by: Phil Alden Robinson
Starring: Alan Bates, Ben Affleck, Ian Mongrain, James Cromwell, Ken Jenkins, Liev Schreiber, Morgan Freeman, Philip Baker Hall, Russell Bobbitt
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President Fowler: Order the planes to stand down, take us to DEFCON-3... and will somebody ask Mr. Ryan if I can use the phone now?
Trivia: Ben Affleck is the third actor to play Jack Ryan. His predecessors are Harrison Ford (Clear & Present Danger, Patriot Games) and Alec Baldwin (The Hunt for Red October).
Question: As President Fowler is being escorted from the football stadium, he tells Cabot to "get the people out of here." How did the President know that the bomb was in the building? No one in the scene knew its exact location, so why does he think that if the fans leave the stadium they will be safe?
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Answer: The President telling Cabot to "get the people out of here" is just a political life boat. If asked what he did when he found out about the bomb he can "honestly" say he asked for an evacuation.
It's unlikely at such a time of panic that one would consider a 'political life boat'. There's also nothing in the character as presented to suggest that would be his thought process. The president's just been told that there's a bomb in Baltimore (not the building) and says "get those people out of the stadium." He's being evacuated from a location that contains thousands of other people. It's fair to assume he knows all those people are also in danger so wants them evacuated too.