The Hagar settlement has a gate, but when it is open there is no sign of it.
Some weapons eject on the left-hand side. Weapons are usually designed to eject on the right-hand side and away from the firer's face.
Kvesir has a balloon with 3 rotors on it. There should be a fourth rotor to counterbalance the third.
The giant in Dead City has its brain exposed. No creature could live long with its brain exposed.
Certain subtitles inconsistent with dialogue.
In-game text and subtitles have grammatical and punctuation errors.
In the Scorcher base, Sarah encourages the Player when he opens the door, but she cannot see the gauges and couldn't possibly know what he is doing.
When the Authority blows doors open, blinking lights can be seen on the opposite side from the side where the Authority troops are. There is no explanation for this.
The Player's Ark was in place for over 100 years in an area with bandits and other people but nobody had yet found it.
The Hagar settlement is not very defensible for a settlement in an area with bandits and mutants.