When weapons switch hands, they actually flip, with spent casings ejecting from the other side of the weapon and even the bolt being mirrored on the longshot.
In the introduction, Dom is (in a flashback) seen getting a tattoo of his wife's name. Dom already had this tattoo in previous games.
The text of the collectibles does not match the text on the actual collectibles themselves.
During the ship mission, Sergeant Fenix asks Cole where his bird is. This question is absent during Cole's corresponding mission.
The weapon turrets on the gas barge are not there in the cutscene.
In the 'Raam's Shadow' expansion, the City Hall Garden has a locked gate which opens onto an area which can be easily reached by walking into another entry into the wall.
In the 'Raam's Shadow' expansion, when Lieutenant Kim asks for the APC, it immediately arrives without there being an interval between it being called for and it arriving.
Someone asks Fenix if he knows how to find Dom when Dom is in the next cabin over.
Sergeant Fenix gives orders out but only he is allowed to complete them by the game engine.
There are two vending machines in the supermarket that are powered on despite the rest of the city having been powered off.
The people who were turned to ashes by the Hammer of Dawn strikes couldn't possibly have stayed in one piece after having been like that for years.
Sergeant Fenix and the others go to the refinery to get fuel, but there is no fuel on the cable car that they take back.
In the 'Raam's Shadow' expansion, Val misidentifies a chaingun as a troika.
When in the submarine, Sergeant Fenix tells everyone to man the pods, even though they are already manning them.
A generator the size of the backup generator for the Maelstrom should have been easy for Adam Fenix to be aware of.