In areas which are optionally stealth areas, if the Player manages to defeat all enemies in that area, the Player's character will still wonder if he can cross without being seen.
Structures should not be as intact as they are given the amount of time that has passed.
In the Nora settlement, the door to the hideaway is still intact despite a siege engine having supposedly been used on it.
Lifts should not be able to rise and fall on their own.
When the Player is watching Asera and Urid, he is in plain view, yet the NPCs do not notice him.
The meanings of the subtitles do not always match the meanings of the speech.
In the Horizon series, radio has just been discovered, yet radio is used in a fairly advanced transmitter used for making a cable car work.
Red-winged blackbirds can be heard in mountainous areas. Red-winged blackbirds are found near water, not on mountains.
A Screaming Piha can be heard in mountainous areas. The Screaming Piha is a jungle bird, not a bird found in mountain ranges.