Factual error: When Nicole Kidman is giving Tom Cruise a Neurological exam she does what she says is called "The Vavinski sign" (running the back of a reflex hammer along foot sole). It is actually called the Babinski sign, a reflex that can be the indicator of brain or spinal cord damage. Big toe goes up and other toes spread = bad (or just ticklish). Nothing = okay. Toes go down = okay. Even professionals (note I'm not one) have trouble interpreting this one, and you cannot get accurate results by doing it on yourself, folks. (00:57:55)
Continuity mistake: In the pit lane before the last race at Daytona, Harry has the hood up on Cole's car. The air cleaner housing is the cowl air induction type commonly used on NASCAR race cars. Seconds later when Cole walks by and Harry explains that they had to change engines, the air cleaner is a round chrome plated type commonly used on street engines.
Continuity mistake: When Harry is telling Cole to "Run 50 laps your way, then run 50 laps my way and I'll beat you every time," Harry is at first wearing a Georgia bulldogs baseball cap. Then a Florida Gators hat when he leans in the driver's window. Moments later when he speaks to Cole over the radio after the test run has started, he's now wearing a Georgia Bulldogs hat again.
Continuity mistake: During many of the races shown in the movie shots from the wrong track are shown. For example, the caption at the bottom of the screen for one race claimed they were at Martinsville speedway, but a shot was shown from Daytona speedway (in one shot you can even see DAYTONA USA painted on the wall!)
Continuity mistake: When Cole goes to get Harry after the final race at Daytona and Harry is sitting on the pit wall, you see that he is sitting on a black banner reading Mello Yello 51. Than the two start talking and after that they race to victory lane. Just when they start to run if you look at the wall where Harry was just sitting the Banner is now Blue and has white lettering.
Factual error: If Cole's car really had that much damage towards the end of a race like the Daytona 500 at the end, he'd be in or near last place. Races on superspeedways like Daytona require the car to maintain its aerodynamic properties to keep up with the race speed. If his car had that much damage he'd probably be black flagged anyway.
Continuity mistake: At the beginning of the race that Cole and Rowdy have their big wreck in, there is a shot of Rowdy's crew chief. He is wearing a coat and the sky behind him is cloudy. Next there is a shot of Cole's crew. They are all wearing short sleeved shirts and the sky behind them is sunny.
Continuity mistake: At one point Cruise and Kidman are talking in a white car when a taxi bumps them at a stop. Cruise throws the car into reverse, slams the gas and they cut to a picture of the wheels spinning - forward! Then the taxi comes around Cruise's car and Tom throws the car into Drive. Again the scene cuts to smoking tires, spinning in REVERSE. The scenes were mistakenly swapped.