Probably the biggest tells of a UE4 game are in screen space reflections for reflective surfaces, and the use of temporal antialiasing (which can cause minor gh

Probably the biggest tells of a UE4 game are in screen space reflections for reflective surfaces, and the use of temporal antialiasing (which can cause minor ghosting artifacts, particularly in reflections). These can be found in other game engines too, but the artifacts of UE4's particular implementation are pretty distinctive (to me).