Revealing: Near the end of the film, after the shootout, there's a shot with the camera zooming in on a newspaper at Will Smith's front door. If you pause it right once the headline fills the top of the screen, you'll notice all the paragraphs are just repeated, word for word.

Factual error: When the monitor with all the information on Brill is shown, Afghanistan is misspelled as "Afganistan".

Continuity: After Will Smith's shoes had both been discarded when they found bugs in them, he runs down the stairs, but you can clearly hear shoes running down the stairs when he's supposedly not wearing any.

Factual error: When requesting images from the satellite, the position (latitude and longitude) is always given in degrees and minutes (but NOT seconds), and a few moments later they get a picture centered on the person they are looking for. Now a minute equals a nautical mile (or 1.85 kilometers), so with a position given in degrees and minutes you'd get a region bigger than 3 square kilometers.... which makes it impossible to find a person that fast (especially in a crowded town).