Enemy of the StateGoofs
Daniel Zavits's camcorder is described as a motion-activated digital video camera by the NSA, yet a close-up of it in the previous scene shows the Hi8 logo. In 1998, only analog signals could be recorded on Hi8 tapes; Digital8 was not introduced until the following year. So it is not a digital video camera.
When Brill and Dean are breaking into the Congressman's hotel room, the footage used of Dean waiting by the door is reused from the footage of Dean waiting for Mr. Wu to open the door. The footage is used twice during the break-in within a few seconds. Dean is wearing a tie and dress overcoat while waiting for Mr. Wu, while not wearing a tie nor dress overcoat when breaking in with Brill.
Errors in geography
In different scenes supposed to be in Baltimore, satellite surveillance is requested first at latitude 39°14', longitude 74°39'; then at latitude 39°27', longitude 74°42'. Both positions are about 100 miles east of Baltimore near Atlantic City, NJ, one of them actually in the ocean. The correct longitude for the first location, for instance, would be around 76°37'.
When the NSA agent watching Brill's vehicle on the Satellite imagery dispatches the NSA "hit team" to Brill's secret location (the "Jar") he tells them to proceed to Latitude 30 degrees, 64 minutes and Longitude 72 degrees, 29 minutes. Not only is this an incorrect syntax to identify a location using that nomenclature, it also places Brill's location about 547 miles east north east of Jacksonville, Florida at a spot in the Atlantic Ocean.
When Zavitz begins to flee, we twice hear satellite surveillance requested at latitude 38°55', longitude 77°00'. That exact position would be around 4th and U Streets Northeast, and giving the coordinates to the minute implies an accuracy of about a mile (a nautical mile, in fact - around 1.15 miles or 1852m). But moments later, as he reaches the roof, the street intersection is given as 18th and Columbia, which is in Washington's northwest quadrant more than 2 miles away.
One of the operatives remarks that the global positioning satellites have an orbit of 155 miles. Such a low-earth orbit for a satellite would be entirely impossible, as it would not be stable at such a low altitude for very long (perhaps two weeks at most). Normal altitudes for GPS's and other earth-observing satellites are at least 600 to 900 Kilometers (372 to 562 miles), and more often these satellites orbit from altitudes of 1,000 miles or more.
In the scene where dean is running on the hotel roof after Brill leaves him, the surveillance team reports that the satellite is coming on-line with "one meter resolution". One meter resolution indicates that the smallest pixel (detail) that can be seen is 1 meter by 1 meter while the film clearly suggests that the satellite has enough resolution to see dean running. Assuming you would need at least "web-cam" resolution (75 pixels-per-inch), the Satellite resolution would need to be roughly 2,800 times higher than one meter (38 inches x 75 pixels per inch = 2,850)
Rachel tells Robert Dean that when she needs to contact Brill, she "chalks" the mailbox, then Brill crosses the chalk mark and she makes the drop. After Dean discovers that Rachel's been killed, he uses a black, indelible ink marker to signal Brill. Brill is very specific about his procedures, and the reason chalk is used is because it can be easily wiped off so it will be clear when she needs to make a new drop. If they continued to use indelible markers, they wouldn't be able to wipe off the old marks and have any way of knowing when a new one had been made. (The marker looks like it could be a dry erase type which could be wiped away and re-used. Also, Robert Dean may not care if it could be re-used as he would have no further need after the next meeting)
The reporter says that a bottle of pills was found in the lap of Senator Hammersley. The assailant dumped the pills and bottle in the seat , the car was submerged. The pills would have dissolved or at the least floated away and the senator was left prone in the seat making it all but impossible that the bottle would be in his lap.