In the scene where Milano is driving the Chevy S-10 and is racing the black Ferrari Daytona, the windows are open in the short shots of the people yelling back and fourth. In the middle shots of the truck and car racing, the windows are closed.
When they are about to start the race, the tail lights of Valentinos Lambo Countach are the original LP500 ones, later when they race Alec and Vic in their Jag, the tail lights are the same as those on the 25th Anniversary edition of the LP500.
When the cop is chasing the Lamborghini on I-70, the line on the road is yellow, meaning a 2-lane highway with 2-way traffic. An interstate would have a white line, indicating 2 lanes going the same direction.