This slip-up occurs when Brian picks up Dom running from the cops after the 4 car street race. They just sped away from the cop car and are talking about their pasts. If you listen, you can hear the car shifting gears but can clearly see both of Brian's hands on the steering wheel. I know this is picky because there are a lot of movies when you see people not shifting but I believe that they should have been more careful about it considering it was a car movie and car fanatics will see things like this.