Inside Hunters if you look in first person, other player characters around you look like they have broken backs or look dead instead of just a proper sitting position. This happens with Aircraft as well, I have seen pilots that look like they have broken backs or look dead.

On Assault Boats, player characters sometimes are just sitting in the air above the Assault Boat but still move along with it instead of the proper seating position, this tends to happen when you exit the boat then go back in.