The fruit that Beck and Travis ate in the jungle was completely different to the fruit that Beck gave Travis' father and his goons. The fruit they eat is actually a regular cheremoya.
The level of orange juice in Mariana's glass when Beck talks to her at the bar
When the jeep falls off the cliff, the shot right before it hits the water has the jeep leaning forward (about to hit the water hood first), but in the next shot it lands flat.
When Beck is walking away from the exploding bus, the cuts on his chest are on the opposite side.
When Beck punches out the camera in outpost 1 the tattoos on his right hand fingers are gone.
Wrong monkeys. Baboons do not live in either South or Central America.
When Johnson tells Scott that he "dropped out of Stanford after two semesters", this is a factual error. Stanford is on the Quarterly system, and not the Semester.
When Mariana lifts the gold statue without any effort it is obvious that it is a fake. The weight of gold is a lot (19,3 g/cm3), so that "Gato"'s weight is at least 20kg.
During the bus explosion, the force pushes Travis away from the bus, but Beck's shirt is blowing in the wind *towards* the bus.
Although Travis is handcuffed, during the fall down the cliff the stunt double's hands are clearly free of restraints for some of the shots.
Obvious doubles when Declan and Beck drive past the "Helldorado" sign.
Beck gets hit by his own stunt double when falling down the hill after crashing the jeep.
Beck is pointing out the footballers in the club to Rudy and the audience are shown their positions and statistics. The majority of the actors who come up with the names and stats are different to how they are credited at the end of the film. For example, Beck points out Jamal Johnson and it shows the actor Jeff Chase. Yet during the credits he is apparently playing Kambui Jackson.
During the fight between Beck and the head Kontiki rebel, each pass of the rebel's knife sounds a "shwing" as if scraping metal; even while completely missing Beck's FLESH.
When Beck and Travis are swinging upside down, they are talking but their mouths aren't moving.
When Declan is driving Beck into El Dorado, they stop for a truck full of rebels and Declan explains who they are. In a close-up of Declan, his mouth is moving but he's saying something completely different from what we hear.
Just before the bulls come charging into the town, you hear glass bottles clinking together, but they are plastic in the close-up.
Beck and Travis were attacked by African baboons.
Wooden supports in the cave would not have lasted 800 years in a jungle environment.
All the characters speak Portuguese so badly that sometimes it's impossible to understand what they are actually saying.
At the end, Beck drops his bag to fight Travis, then when they walk away he never picks it back up.
At the start of the film when Beck is pointing out the guys surrounding Knappmiller, he refers to the character of David as Jimmy, the other man in the relevant scene.
When Travis goes to the washroom in the jungle he never zips himself back up!
Beck points "Jamal Johnson" in the club but it is later made clear that the character's name is Kambui Jackson.