Goofs

After one mule falls off the trail to its death, they come to rocks the mules can't climb. They let five mules go when there should only be four.

In the beginning of the movie, 4 officers get out of the helicopter and enter the barrio for the long walk up to the rooftop. When they get there to oversee the attack, there are now 5 officers.

AR rifles have spring-loaded dust covers that automatically pop open on firing but must be manually closed. During the firefight on the rock slide, after the team members fire their rifles, the camera cuts back and the dust covers are closed.

When the team's vehicles arrive at the airstrip, they are remarkably clean for having driven a long distance on rugged unpaved roads in driving rain.

After the team crashes the helicopter, they are miraculously able to fit the enormous stockpile of duffel bags filled with cash onto only 3 mules. The amount of bags placed on the mules is far less than made up the original amount carried on the helicopter. One might assume that they just loaded up the mules with as much as they could and left the rest, but that would negate the entire purpose of giving the village leader the one million in reparations inside the hut.

While in the mountains, sound of incoming shots is heard before bullet impact. Bullet travel time is faster than sound so shots should be heard after impact.

It is implied that the team flies all night to reach the Andes, and the Brazil-Colombia-Peru border area is about 700 mi / 1,100 km from the Pacific coast. The Mil Mi-8 helicopter they are flying would require multiple refueling stops to make this flight given the high altitude, heavy load, and extra drag from the hanging cargo net.

$250,000,000.00 in $100 bills weighs 5,500 pounds. The cargo helicopter they're using should easily have carried that much weight.

Santiago claims that Colombia does not possess facial recognition cameras. This is incorrect. NEC installed such cameras beginning in 2016.

When they drive across the international border into Brazil, a sign in Spanish can be seen: "Bienvenidos a Brasil". Brasil's language is Portuguese; not Spanish. (The greeting in Portugese is above the greeting in Spanish, but blocked from view very quickly by the rear view mirror.)

The team spends days and nights crossing the Andes, without any food, water, or fire, apart from the cash they burned.

Though the team isn't shown drinking or eating, doesn't necessarily mean they actually don't drink or eat. And even if they don't it is still very possible to accomplish what they did.

What happened to the pilot(s) who originally flew the helicopter into the landing strip to pick up the bags of money?

The helicopter pilot is the man in the black jacket and sunglasses who is briefly seen walking from the helicopter towards the small airplane that the Helicopter Businessman used to reach the airstrip. When the team leaves, the airplane is gone. The two men presumably left in the airplane while the team was loading the bags of money into the helicopter.

Early on, Ironhead receives a high velocity bullet wound to the abdomen. Doesn't seem to cause much pain, he dabs the wound with (maybe?) some tissues and it's never mentioned again, he treks across the Andes, gets into firefights, no problem.

He dresses his wounds with a trauma bandage, especially designed to help with gunshot wounds. Being a special forces operative he can be expected to operate with the pain as it is.

Far fewer bags of cash are placed on the mules than were carried on the helicopter. Simply abandoning the remainder would seemingly negate the entire purpose of negotiating with the village leader for a certain sum as reparations.

Neither the team nor the villagers are necessarily acting rationally. The team needs to leave as soon as possible, both parties want to avoid escalating the situation again, and it is unlikely that anyone could accurately calculate how many bags the mules could carry. It is entirely plausible that the team would abandon the excess money and flee rather than wasting more time renegotiating the truce.

The helicopter's tail boom displays both faux-Soviet "CCCP" civil registration marks and the distinctive triangular tricolor insignia of the Hungarian Air Force. No real Eastern European aircraft would display both sets of markings.

Although numerous former Soviet client states in Europe once operated or still operate aircraft left in their territory by the Soviets when the Iron Curtain fell, these nations sought to legitimize their claims by rapidly painting over all Soviet markings, often in a matter of hours after their last Soviet "guests" left.

The team are driving all together in a truck and discussing whether to do the job. It is raining but the rain runs down the window, not across as it would in a moving vehicle.

As the team approaches the crest of the Andes in the morning, the sun dramatically shines directly in their faces. However, they are flying west towards the Pacific Ocean, so the morning sun should be behind them.

As the team leaves the airstrip, snow-capped mountains are seen in the distance behind them, and they fly over a jungle valley towards a second snow-capped mountain range. It is implied that they fly all night, and in the morning, they approach yet another snow-capped ridge.

In reality, the high ridges of the Peruvian Andes form a long north-south strip that is narrow enough for a slow-moving westbound helicopter to overfly in about two hours, and they are not interlaced with jungles. Nowhere in South America are there three different snow-capped mountain ranges separated by such vast distances of jungle.

The film's title supposedly refers to the area where the borders of Brazil, Peru, and Colombia meet. However, that area is actually called "THREE frontiers". The "Triple Frontier" is the area where the borders of Paraguay, Argentina, and Brazil converge.