Grammar inconsistencies in the subtitles.
In spite of not being depicted with a helmet or visor, the Player has an HUD.
Even though Singapore does not have a functional government, emergency vehicle sirens can be heard in the background.
During the 'Vengeance' Mission, Hendricks and the Player do not try to help a man who is being hanged.
Kane says '54 Immortals Enforcer'. It should be '54 Immortal Enforcers'.