In the scene when Seagal shot the two cops in the apartment, the surviving one had a bullet hole on the back of his jacket with a blood stain. However the jacket is new and clean in the later scenes.
In the car chase at the beginning of the film there is no passenger in the taxi; the little girl is only visible in the close-ups.
During the chase between the car and the helicopter as they flee the safe house, the helicopter wrecks the lid of the trunk and riddles the rear window with bullets. In the next scene all the bullet holes are gone and the rear window is whole again.
After police officer Urick is shot through the chest, an exit would is clearly seen in the back of his jacket. In several later scenes, only the blood at the entry remains visible.
The two supposed Russian gangsters are speaking Serbian in between them, not Russian.
Near the start, a guy hacks into the IRS and offers to wipe out Seagal's tax obligations. The site is IRS.com. It should have ended with .gov, or some other non-commercial designation.
(at around 40 mins) In the beginning of the film, you can clearly see the road block which has been set up by the film crew for the car chase.
In the first scene, the Audi wagon has 2 people in it, yet during the car chase it can be clearly seen there there is only 1 stunt driver, and no passenger.
When Seagal and Anya leave her ransacked apartment, a seasoned, motivated ex-spy wouldn't "hole up" somewhere overnight. He'd go immediately to the place Anya stashed his daughter before any of the bad guys could get there first.