At around 3:13 minutes into the movie, Booker is checking into a hotel in Morocco with Andy. In the background a character can be seen disappearing entirely as he is talking to the clerk.
After Nile becomes immortal, she still has holes in her ear lobes from earrings - they should have healed and vanished instantly.
Incorrectly regarded as a goof. Nile uses the phrase AWOL (Absent Without Leave), except the Marines use the phrase UA (Unauthorized Absence) - AWOL is a term widely known, while UA is not, so the film makers were just making sure that the viewers knew what the character meant.
Copley and Nile park their car on a double yellow line in central London, but half an hour later the car hasn't even been ticketed, much less towed away.
Nile says 'AWOL' (absent without leave), but the official Marine Corps term is 'UA' (unauthorized absence).
When the female Marine character named Nile has her throat cut the other Marine calls for a Medic, repeatedly. Marines receive medical treatment from Navy hospital corpsmen, but the filmmakers may have used the more recognizable term "medic" because an average viewer may not know this.
The French cemetery has a lot of Celtic crosses, which are extremely rare in France outside of Normandy.
When the A6 drives across the grass in 'Surrey', tracks from previous runs of both the car and the filming vehicle can be seen in the grass.
The immortals are shown healing, even to the extent that bullets are pushed out by the healing tissue, but Andy's ears both have piercings with metal jewelry in place. To be consistent, none of the immortals should have earrings or other body jewelry.
The car used in the scenes in France has a number plate with the F for France (in the blue segment on the left) but the actual number NJSW-68-R bears no resemblance to a French registration.
While in the pharmacy, Andy (Charlize Theron) places at least a dozen items in her hand basket, but after being treated by the clerk for her wound, she leaves without taking anything with her.
In the scene in Surrey, England, where they are driving across the grassy field going to the mansion, the car used has curved down exhaust tips, indicating its a diesel model, but the sound is petrol engine sound and later when they come out of the car the exhaust tips are straight indicating it is indeed a petrol version of the car.
When pitching the South Sudan job to Andy and Booker, Copley states that the kidnapping occurred at a school southwest of Juba. Immediately thereafter, he places a newspaper covering the incident onto the table, which reveals the location of the attack to have been Mundri region. Mundri is northwest of Juba, not southwest.
The abandoned mine where Andy takes her team to is in, or close to Val d'Argent, which is located in the Haut-Rhin department. She mentions that she had found the place during the Baussenque wars in the XIIth century, but these wars took place in the Provence region, some 550 km further south.
When Booker hands Andy the unloaded HK USP, she should have noticed. Anyone as familiar with weapons as she is would notice the weight difference between an unloaded gun and a loaded one. The balance of the gun without bullets in a polymer handle would also be very noticeable. Nile, as a marine, also would have noticed when Andy gave it to her.
When Andy deletes a picture from a tourist's iPhone, she only moves it to the album "Recently Deleted". The picture can still be found and restored by the tourist.
After the first confrontation, (33 min in) Nile fails to retrieve her weapon, the knife Andy pulls from her upper arm and throws to the ground. Nile passes it by and follows Andy to the automobile.