The miniguns on the helicopters are said to be of 12mm caliber. Miniguns are of 7.62mm caliber.
An Mi-24 helicopter could not possibly lift an object as large as the mainframe at Mount Yamantau.
Vehicles explode after they are shot enough times. Gasoline is flammable, but not explosive, so they should not explode.
The miniguns aboard the helicopter are listed as 12mm. There is no such caliber used by the U.S. Armed Forces.
Weapons such as the MP5 are shown in use by the wrong side; East German forces would not have been equipped with these.
Tracer rounds are depicted as being used in nearly every weapon. In reality, tracer rounds seldom are loaded into any weapon other than machine guns.
While laser sights did indeed exist in 1981, they were far bulkier and more crude than depicted.
The monitor at the computer terminal in the Soviet computer center is monochrome. However, the phosphor changes from amber to orange, which cannot be done with a monochrome monitor.
The building in Cuba wherein the atomic device is being kept appears to be paneled in wood, yet instead of wood, there are stacks of drywall panels waiting to be installed.
The laboratory wherein the atomic device is being reverse-engineered only has gas masks on the wall rather than radiation protection suits. Gas masks provide no protection against a criticality event.
Many weapons are depicted anachronistically. For example, the AK-74 came into service in 1974, yet is depicted as being in use in 1968.
An electro-magnetic pulse weapon is used in the final mission. As of 2021, electro-magnetic pulse weapons have yet to be invented.
The term 'LOL' appears in the game. The term 'LOL' did not come into use until much later.
IBM 5150 computers are depicted in early 1981. These computers only started coming out in late August, 1981.
The model of mobile phone seen at the safehouse does not come into public use for 2 years after the time that it first appears.
The helicopter rotors at the U.S. base in Viet Nam are not spinning as fast as they sound.
Yugoslavia is shown as having atomics within its borders as part of Operation: Greenlight. Yugoslavia is part of the Non-Aligned Movement and isn't a N.A.T.O. country.
Soviet and Soviet-allied forces are shown using weapons that are used by Western forces.
Mr. Adler adds a silencer to his weapon before entering the Vault, even though no stealth is involved.
Mr. Hudson states that Perseus tried to steal an American atomic bomb from a fire base in Viet Nam. An atomic weapon of any type is a valuable strategic asset and it is extremely unlikely that the U.S.A. would keep such a device inside a conflict zone.
The Player is required to neutralize an NPC watching security monitors. The NPC can be eliminated by non-lethal means, but since the NPC identified the player character, it leaves the NPC as a witness.
It is inevitable that the Player must neutralize any soldiers that he finds in the KGB building that obstruct the mission, but the elimination of any soldiers in the KGB building would alert investigators and compromise the mission.
The team leaves the Cuban facility but leaves behind the atomic device in Cuban hands.
Performing a takedown on an NPC May drop his hat to the ground. The hat doesn't draw suspicion from any other NPCs.
It is possible to eliminate an NPC when someone is calling that NPC on the radio without it arousing the suspicion of whomever is on the other end.
Mr. Adler refers to the Player as 'they' even though the Player is singular.