During the race between the SLR and the Diablo Roadster. The shot of the Shifter is actually a 6 speed Gear lever out of a Gallardo (Diablo is a 5 speed), when the the wheel of the Gauge cluster shown is actually from a 2004+ Murcielago with E-gear (most likely the Murcielago Roadster).
During the race between Natasha and Jason which goes terribly wrong with Jason dying we see a helicopter at the start following the cars in the air from behind making video and then when they show both the cars from front there is no helicopter. And keeps on appearing and disappearing all through the race.
After Infamous boots Mianda off his private plane, the jet is seen taking off about 50 to 100 feet behind her. In reality, a private jet that size would need to take off in at least 1,000 feet. A jet wouldn't take off in the distance shown in the movie.
The scene where Carlos ride to his revenge mission in a Ducati 999, the engine noise that can be heard coming out is an inline 4. The 999 uses a L-Twin, which make a different noise to Carlos' sportsbike in the film. Ducatis have never used an I4 engine in their R Motorcycles, only V twins, L twins and a V4 (Desmosedici). An "inexperienced ear" might think the sound from the scene is even from an I3 (as used in Daytona 675) or V4 (Desmo, Aprilia 2009) but it is an I4.
At the beginning of the film when Carlo is seen waiting at the airport, he is wearing his Army Class 'A' uniform, but has a goatee. With the exception of a thin mustache, soldiers are not permitted to have facial hair. If he was discharged from the Army, he shouldn't be in uniform anyway. Even if he was discharged into the Individual Ready Reserve.
The film describes the races between 2 or more cars as 'drag racing', which is incorrect as it is in fact a straight line acceleration contest over a fixed distance, usually 1/4 mile. No corners, no interaction between the cars. Also it may be incorrect to describe the races as 'street race' as the first held between cars is a closed road race, however unsanctioned otherwise illegally run, judging by the lack of safety amenities drivers and cars are required to have in a 200mph race such as helmet, 3 layer Nomex suit, rollcage and on-board fire extinguishers. The second gambling race is 'open road' race, similar to Nevada's Silver State Classic, which unlike the actual race, lacking in the required safety amenities.
The goof item below may give away important plot points.
When Carlo and Jason drive off in a Lamborghini Murcielago Roadster after Carlo encounters a couple of thugs in a party, the thugs chase after them in a Ferrari 612 Scaglietti. The Lamborghini gets away by speeding underneath a truck trailer, while the Ferrari crashes after clipping the underside of the trailer. However, the car that crashes is a Ferrari 456M, not a 612.