In the highway scene where Brian (Paul Walker) and Rome (Tyrese Gibson) are being chased by the police while Verrone's henchman are riding in the cars, Brian's car is hit with one of the electronic three-pronged "Claws". After removing it and throwing it into the grille of a police cruiser which causes the massive pile up, if you look behind all the cars and smoke you will see blue flashes of light on the extension of the highway which could have been a glitch in removing the backdrop of the scene on a blue (given the color of the flash) and or green screen.