Continuity mistake: In the first scene where President Andrew Shepherd encounters his daughter practising the trombone in her room, he talks to her about a parent-teacher conference and hands her a book. In the shot where he hands her the book, it is right side up for the girl to open easily. In the shot where she receives the book, she has to turn it around to open it.
Continuity mistake: In the meeting room with the White House Chief of Staff, Sydney is giving a self-righteous speech about the President being president of Fantasyland. When the President walks into view, she immediately stands up from her chair. Then in the next shot, she immediately stands up again.
Continuity mistake: The morning after the President and Sydney have spent the night together for the first time, while Sydney is getting dressed to leave, the collar of her turtleneck sits flat in the front (around her neck), but in the next shot the same collar is dog-eared in front, then goes back to sitting flat.