Dale drives down the pit road at Daytona International Speedway, the outside wall of the pit road at North Carolina Speedway is visible. Daytona has no pit wall.
Though the cars used in re-enacting the races of the 1970s and 1980s are authentically correct, the track billboards are not. You can see the current Pepsi logo on one of the billboards. Also, Sunoco (the current fuel supplier of NASCAR since 2003) has their logos on the track when the fuel supplier of NASCAR during Earnhardt's era was 76.
Many cars depicted in the 2001 Daytona 500 are incorrect in terms of body styles and paint schemes. Most noticeable are the cars of Jeff Gordon, Bobby Labonte, and Rusty Wallace. Gordon's car sports the old rainbow color scheme when 2001 was the first year his car sported the blue/red flame paint scheme. Bobby Labonte's Interstate Batteries car is Chevrolet Monte Carlo, his actual 2001 car was a Pontiac. Wallace's car in the film is a 1998 Ford Taurus using the old blue/white Miller Lite paint scheme (the actual car was a 2001 with an all-blue Miller Lite paint scheme).
There was a shot of the RV park during a race identified as 1990. There was an orange Tony Stewart flag in that shot. Tony Stewart didn't start driving the #20 Home Depot Car in Winston Cup until 1999.
At the end of the movie, where Dale Earnheardt is shown at his last race at Daytona, Bobby Labonte is shown driving a Cheverolet Monte Carlo. Labonte was, in fact, driving a Pontiac Grand Prix in that race, and did not drive the Monte Carlo until after Earnheardt's death.
During an interview, after the Richmond race, Dale says he was "only trying to rattle his cage." This was not said at Richmond, but at Bristol, many years later, after crashing Terry Labonte.
Later on when Dale is in his late teens and racing the pink k-2 Ford, there are scenes with the front bumper, then without, then with, then without. You'll have to rerun it a couple of times using the pause & rewind, but you'll notice.
In the 1998 Daytona 500 post-race celebration on pit road, the Coors Light team is shown wearing the current (2001-2004) pit uniforms. The ones in 1998 were blue and brown.
In a scene set in the mid-1970s, Dale Earnhardt places money that he won by winning a race on a table. On top of the stack is a $20 bill with a design that was introduced in 1998.
Harry Gant's 1989 Skoal Oldsmobile appears in the 1986 Richmond race, where Earnhardt wrecks Darrell Waltrip.
When Dale was racing for Rod Osterlund, the car hauler his crew chief was driving is a 1989 Chevrolet R-3500 Silverado. Dale was racing for Osterlund between 1979 to 1980, nine years before the truck was introduced.
Right after Brenda leaves him, and after Dale finishes in third place to finish in the money, Dale returns home and puts a stack of $20 bills on the table. The design of the twenties are the new design, created in 2003, while the scene takes place in the 1970s.