Throughout the film, Rick is building a Mazda RX7 FC. During his "test drive" scenes, he drifts into a corner in the RX7, but exits driving a Nissan Silvia S14. This may be due to the fact that the "hero" car was stolen during production.
The green car, when seen drifting, and in many racing scenes, is a Nissan Silvia, but when it is in the garage and being worked on it is an RX7.
Throughout the green car is referred to as a mx5. It is clearly an rx7.
In the beginning Kayce is describing his car as a Nissan Skyline GT-R when the car in fact is named only (Nissan) GT-R. The GT-R is based on the older Skyline but doesn't carry the name anymore.
Sean doesn't want to be a race car driver. He wants to be a computer.
As the green car is getting pushed into the cross traffic they are being pushed into a One Way - 4 Lane Road. When it cuts to the side angle showing the oncoming vehicles, it is a much narrower 2 way street.
(at around 38 mins) When race is over, the stunt man is visible in the car, before switching to the actor.