Character mistake: In the opening scenes when Brian goes back to the shop, he demands that he needs some nitrous to boost his low top speed. Well I'm sure that most tuners will agree that more horsepower doesn't equal more top speed, it only contributes IF you have a transmission that can handle it and distribute it. I was sure they'd had some type of car advisors on the film....
Character mistake: When Brian looses the race against Dom, Dom states that Brian didn't know how to drive and was 'granny shifting' instead of 'double clutching like you're supposed to'. Double clutching is NEVER done in drag racing as it requires twice as much time to shift and is ONLY done when down-shifting. It is used to synch the engine RPM with the speed of the wheels but new cars have syncros that do it for the driver.