In the shootout at Spiking's house, the bullet hole pattern on the window is different when seen from the inside and outside.
When Spikings is watching the video of him and Carla, we see her walking with a briefcase, but earlier in the other video she didn't have it.
Near the beginning, when Chase is riding with Regis in his car, you can clearly see that the shifter is in park while they're driving.
When Det. Regis meets Kyle at the park, the gun he removes from Kyle's coat has a silver barrel. When the detective returns Kyle's gun to him, the gun is entirely black. It is clearly not the same firearm.
When first arriving at the crime scene, Det. Regis is directed to go down the short hall and turn left. Yet the room he enters is down the hall and to his right. The spoken directions would have been essentially correct if they had been issued one hall earlier.
When Regis set off the alarms by entering the White House via the tunnel, that would have set the White House on an immediate lock down. The president would not be out walking around.
Shooting bullets into the gas tank of a vehicle will not start a fire as shown.
When the lab tech prints out the blown-up picture of the secret service agent's head, the image has a black border like the edges of a negative. If the image were really blown-up and cropped, there would be no border visible.
At beginning when Regis disarms guy wanting to shoot himself, he says that "safety was on". If you look carefully at frame where gun is on the ground, you will see a red dot visible at frame area indicating that safety is NOT ON.
Near the end of the movie where Nina Chance waits for the secret service to arrest her in the tunnels, she runs up a flight of stairs and attacks an agent. Clearly this is a stage built as the walls are wobbling during the action scene.
When Nina steals Carla's Filofax, she places it in the waist of her trousers. When she is running away from the secret service agents in the alley, the Filofax isn't there.
What is supposedly the leg of Detective Regis as he is standing on a ladder discovering a hidden microphone in his apartment, with Detective Stengel next to the ladder, is a single leg on the ladder's paint can platform, not a ladder step; the platform couldn't support the weight of a person.
At the beginning of the film, after Regis has knocked out a suicidal bureaucrat, an accompanying patrol officer's pistol clearly has a bright orange dummy gun barrel.
A restroom in a secure building like Secret Service headquarters would have at least a screen over it to prevent unauthorized entry.
Nina Chance says that once the beams are broken at the White House entrance from the tunnel that the room will fill with agents in 10 seconds. It took at least 10 seconds for the person manning the security desk to give the location of the breach ("tunnels"). It is another 20 seconds before the first agent there even opens the door to "the room" (between the door and the beams).
Nina Chance is said to have a gold medal in "Sharpshooting" in the Olympics. The Olympics have several shooting sports. Rifle, Pistol, Shotgun and Air Rifle. "Sharpshooter" is a rank in shooting sports. "Sharpshooting" is not a sport.
Police officers are wearing their duty hats inside of the building during multiple scenes where Regis is inside of his police precinct. Police offices take their hats of inside of buildings as they are uncomfortable to wear and there's no need for them inside of a building.
Watches (timepieces) are featured several times throughout the film to establish time line. All of the watches shown worn by multiple characters are made by Raymond Weil, a luxury watch brand. It's very unlikely that civil servants would be able to afford the watches on their salaries.
Agent Chance (Diane Lane) wears high heels throughout the film.
A woman in the Secret Service protection details would not wear high heels.
A woman in the Secret Service protection details would not wear high heels.
Snipes character claims that the Interstate Commerce Commission (ICC) is evicting him from his home. The film, which was made in 1997, takes place two years after the ICC was abolished in 1995.
Throughout the film, the president's adviser is called Alvin Jordan. However, when he was introduced to detective Harlan, he presented himself as Elmer Jordan.