When the man is lifted to go down the chute, he is barefoot. At the bottom of the chute, he has shoes on.
When Barney is in the secret room with Maryana, he asks her about her family and she writes on her slate. The overhead shot of her writing shows the words "All dead" on an otherwise freshly-cleaned slate, but in a side shot as she continues writing, the slate suddenly has evident chalk dust and the remains of words incompletely erased to allow for more writing.
During the chase scene, near the end, the interior shots of both cars show the passenger sitting in the middle of the seat right next to the driver with their right arms in front of them. The exterior shots have the passenger sitting next to the door with their right arms in the window and hands near the A pillar.
When the team is fleeing in a stolen police vehicle, Jim is wearing a white officer's hat. As real police cars chase them, Jim is no longer wearing his hat. Doug is driving, and Jim tells him: "Swing around behind that hill and stop." Doug does so, and Jim exits the vehicle, once again wearing his white hat. As Jim aims his gun at the pursuers, his hat magically disappears in an instant.
The story takes place in an African country, but Barney (and his book) and Maryana are using ASL, American Sign Language, specific to North America - the United States and Canada. The country they are in would likely have its own sign language.
Sign language is not universal; nor does it correspond to any particular spoken language. It develops, like spoken language, geographically, with its own grammar, syntax, and slang, For example: British Sign Language, looks completely different from Asulan (Australian Sign Language) both of which are very different from ASL, even though English is the primary spoken of all four countries.
During the helicopter pickup at the dam, American road signs can be seen a stop sign and a green "mileage to" sign with the words "Pacific Coast Highway" and the number of miles to it.
When Jim "unlocks" the camper, he doesn't insert the key in the lock.
The Bell 205 "Huey" helicopter had a U. S. registration number (N4766R) and also what appeared to be an American phone number on the tail boom.
A "Stop and Go" convenience store is seen. Locations are only in the USA.
At about 04:50, the IMF van drives past a building with a large partially obscured sign saying "..age.". The building is one the Paramount Studios sound stages, visible from the backlot.
At the end as the IMF team flees from the police, which are in contact with the rest of the squad, Phelps fires a single shot that not only halts the police vehicle but also disables their ability to use the radio.