The code used for helicopters' rotor blade rotating effect is bugged, making it not work properly.This did indirectly fix a visual bug where the double-rear wheels would only leave single tire marks on the road though. Some large trucks have double-rear wheels on the consoles, but not on the PC version.Code does still exist for a 2-player pool mini-game though. The co-operative play modes in the console versions were removed from the PC version.
AI drivers will get extreme road rage and drive after/into you if you bump into them more often on PC.It's unknown if this was intentional or not.