Black DawnGoofs

From the time the terrorist activates the bomb and starts the countdown from 05:00 to the time we see the bomb in the back of the helicopter 1:20 of screenplay has been shown but the counter has only counted down to 3:58.

When the bomb is armed the CIA agent tells Seagal to disarm it but he refuses, stating that tampering with it might set it off but when the bomb is seen in the back of the helicopter the printed circuit boards that acts as the electronic trigger and countdown is clearly seen lying on top of each other. This would also be extremely dangerous because the PCBs would be in danger of being short circuited and thus detonating the bomb prematurely.

Cars in the Amsterdam scene have license plates registered for lorries.

When paying for the physical nuclear device with diamonds, the European-terrorists say that they will give the American thugs a key to a safe deposit box with the rest of the diamonds after they get the plutonium. More than just a key is needed to get into a safe deposit box, you have to show ID and your signature must match the Signature Card for the box. The only other way is with a court order to open the box.

During the fight scene with Seagal and Greer, you can clearly see it's not Seagal but a stunt double. His jacket even changes between black and grey.

You can see that the rear-view mirror of the Toyota SUV has been removed.

You can see that the rear-view mirror of the Ford Expedition has been removed.

During the opening scene, the guards in the armored car are carrying Uzis. In real life, Dutch security personnel are not armed.

Cameras are visible attached to the side of the truck, concealed in black plastic.

A camera is visible on the ground, next to a car just after the truck smashes into the side of it.

Prosthetic dummy visible inside car when truck smashes into it.

When the team is producing the counterfeit ID near the start of the film, they simply overlay Cole's photo onto the ID badge. However IDs for high security would have security printing that would go across the picture specifically to prevent this simple fakery.