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Revealing mistakes
Some of the CIA officers at Langley have suppressed pistols but when they shoot them, they make a loud noise. This can be attributed to artistic license.
When Sam knocks grabs or knocks out a guard while he holds his weapon in his hands, the guard will never drop the weapon, not even after picking him up or dropping him.
When Fisher is in the Osprey en route to his first mission, Grimsdottir is standing behind him, hands on his shoulders. The camera view that Lambert has of Fisher shows nobody behind him.
In one of the FNW newcasts, a general is giving a press conference at the White House, but the bottom graphic says it's a U.S. military base.
Knocking out a guard obviously makes a lot more noise than shooting him, even though its supposed to be the stealthier way. The game's explanation is that other guards can hear him groan when shot, but they don't seem to hear the noises made when you knock him out (he still groans, and then hits the floor rather hard).
The CIA Headquarters in real life is guarded by the CIA Security Protective Service, but in the game it is shown as being guarded by private security guards.
The U.S. soldiers in the Abbatoir level have the flags on their uniforms backwards. They're supposed to be with the blue field facing forward. Also, they're missing the nametapes that go above the chest pockets.
U.S. soldiers are shown wearing their sleeves rolled USMC-style.
Wilkes has a silenced pistol, but when he fires it, it emits an unsilenced sound. This can be attributed to artistic license.
The signs on the Russian submarine Vselka are in English and not Cyrillic.
The wet floor signs at the Georgian defense ministry are in English, not Georgian.
In one cutscene, General Fisk appears without his ribbons on his uniform.
Some of the CIA officers at Langley have suppressed pistols but when they shoot them, they make a loud noise. This can be attributed to artistic license.
In the newscast announcing Nikoladze's death, it says he died in 2003, when he died in 2004.
The Player is given the option to shoot cameras in order to pass them. Doing so would alert the operator as to something being amiss.
Mr. Fisher has a radio which has a glowing green screen, as well as night vision goggles that glow visibly at the front. These would defeat the purpose of stealth.
The Player can somehow manipulate objects that are right in front of hostile NPCs.
In the areas under construction, the size of the bricks on pallets do not match the size of the bricks in the walls.
In the Kalinatek level, the emails dates say 2002 on them when it's supposed to be 2004.
The news ticker on the October 2004 FNW broadcast says that Athens is preparing for the Olympics. The Olympics in Athens were long over by then.
In the Embassy level, a technician says "Data sticks" but the caption says "Memory sticks".
The map at the Russian naval base in the Vselka mission is in English, not Cyrillic.
The cutscene showing Andrews AFB depicts hills around it. The area around it is actually mostly flat.
The exit sign at the police station is in Cyrillic, not Georgian.
There is no Morevi Square in Tbilisi.
A Lincoln LS parked at the Kalinatek parking garage in Langley has a European-proportioned license plate. North American license plates have a 1:2 aspect ratio.
After Wilkes is shot, the V-22 Osprey is seen to be in Russian Airspace. Russia is a little over 5600 miles from Langley. The Osprey has a cruise speed of 277 MPH, meaning Wilkes would have been bleeding in the back of the Osprey for 20 hours.
In the Burma mission, if a Chinese soldier spots you the streets of Rangoon, he'll say the embassy is being invaded when he is not in the embassy.
In the Burma mission, a Chinese soldier refers the PRC as an empire. Since the PRC is nominally a republic, he should have referred to it as a republic as 'empire' has negative connotations.