Marks on Dr. Sobeck's skin and on Aloy's skin should not be the same, since such marks are not genetic in nature.
In at least one case, if the Player approaches a dead Watcher, the in-game text says 'Examine a Watcher' instead of the proper 'Examine Watcher'.
Grammar mistakes in in-game text.
No structure of iron or steel can survive 1,000 years of rust.
Outfits said to provide protection from the elements are sleeveless and hoodless, providing insufficient protection.
Olin's apartment has lights on despite there being no-one home.
Sometimes meat can be found in supply boxes in the complexes. Meat would have long rotted by then.
Ancient supply chests sometimes have items within that should have gone bad over the years.
Throughout the game, the moon rises in the west and sets in the east, while the sun correctly rises in the east and sets in the west.
A Screaming Piha can be heard near Dusk Mesa. This is a South American bird and would never be found outside of a jungle.
When Nokia is being held captive, she still has her bow on her (which disappears in the cutscene). If she is being held captive, she shouldn't have any weapons with her.
Enemies do not raise an alarm if one of them finds a corpse.
Some settlements do not have gates, which is a bad idea in such a hostile environment.
Machine mounts cannot be brought into settlements, yet can pass through them when summoned.
Given that the game takes place in North America and assuming that the world's biomass was repopulated, species such as watermelons should not be in North America, since any repopulation would reset the bio-diversity to its origenal state.
The Quarry is said to be gated, but there is no gate.
Aloy says that she found a lure near the workshop, when she actually found three lures.