Goofs

When Dean finally collapses against the shed at the end, his rifle is propped against the shed to his left. He passes out. When he comes to moments later surrounded by cops his rifle is no where to be seen.

When Lammark introduces himself to Eleanor in the kitchen, he has his left hand on his chest, then in the immediate next shot, his right hand is on his chest.

The position of Lammark's hands, when he holds the document that Eleanor has been keeping from him, change from the sides to up and down in the next shot.

When Eleanor and Lammark are questioning Dean's mother in her kitchen, two rolls of paper towel are, at various times, on top of or missing from the stove.

The FBI team identifies the rifle as a XM21 based on ballistic data. The XM21 was an accurized M14 rifle that fires a standard 7.62×51mm NATO round. The round is so ubiquitous that it would be impossible to tell the rifle simply from a projectile. An actual rifle would be needed to test forensically against any recovered bullets or fragments. It is all but impossible to determine a type of rifle based on the caliber alone.

Eleanor said she applied to join the FBI but she also said she didn't have a college degree. FBI Special Agents require a college degree plus 2 years practical job experience.

Eleanor has a history of drug addiction. No police division in the country would hire anyone with a history of drug addiction.

The main character is said to have applied to the FBI for the position of special agent/investigator. But it's also stated that she never went to college. One of the requirements to apply for the FBI for a special agent position is a college degree so she never would have even reached the point in the hiring process of being evaluated. And even if she had a college degree admitted drug addiction would have also disqualified her from further consideration prior to a psych evaluation.

It is common misconception that vegetarian or vegan people are necessarily iron-deficient.

However, though not all vegetarians/vegans are "necessarily" iron-deficient, they typically do have lower iron levels than people who eat meat.

One cannot turn off the communication system and speak at normal volume to the passenger next to them in a noisy helicopter and be heard.

There is no oxygen running through Eleanor's mask as revealed by the fog she makes breathing in it.

In the beginning, a powerful spotlight shines in the middle of the street and moves around while this sound of a helicopter is heard. This is a "movie" spotlight, or the helicopter would have to be very close to the ground to shine this way.

Multiple lasers are used to pinpoint the shooter's nest. Laser beams are not simply visible in air; airborne particles are necessary to make the beams visible.

The outside of the Baltimore Maryland pharmacy building has a sign for a Canada Post outlet location.

During the first flyover shot of Baltimore, as the police make their way to the crime scene, a view of VIA Canada station can be seen in full view. Needless to say, VIA Canada stations are not present in Baltimore but are present in Montreal, Quebec, Canada, where the film was shot.

Eleanor shows up first to both the sniper and mall shootings. She walks past victims still dying and through crimes scenes with casings everywhere. No one else shows up until later.

The electricity is put back on in the building just a few minutes after the explosion, when it still could trigger more damage (leaking gas pipes, fire hazard, etc.).

The paramedic should have checked Eleanor's oxygen levels with an oximeter and adjusted the flow of oxygen. Usually "non re-breather" masks (with a small plastic pouch underneath) are used in case of intoxication with fumes, etc.

FBI Agent Lammark says "no casings, no brass" these are one and the same. Brass is a common slang term for shell casings. Anyone in law enforcement would know this.

Lammark, unlike an American, enumerates three things starting by using his thumb as one, forefinger as two then middle as three.

Americans count one with their forefinger then two with the middle and three with the ring finger.