Continuity mistake: At the end of the opening credits when the freight is being placed on the truck, you can see the large support beam that goes across. In the next shot when the civic goes under the car, the support beam is gone. (00:00:40)
Continuity mistake: In the opening hijack scene, the semi obviously has two sets of rear wheels on the trailer, but when it comes to the scene where the black Honda is under the trailer, there is only one set of rear wheels. (00:01:11)
Continuity mistake: In the first hijacking, the window is pulled out and the rubber seal hangs from the lorry. Camera cuts to the next harpoon and the seal has gone. (00:01:30)
Continuity mistake: In the beginning of the movie when Brian drives the Eclipse, if you watch closely he redlines then shifts to second. The problem is that when they show the over head picture he shifts into second once again. (00:03:29)
Continuity mistake: When Brian is topping out his car in the stadium parking lot at the beginning, it looks like he's shifting and steering with the same hand, as the shot is reversed. Easiest way to tell is the "Sparco" on his seat is backwards. (00:03:29)
Continuity mistake: While Brian is running the Eclipse through the stadium parking lot, he shifts and the car jumps from 120 mph to 140 mph in about one second. (00:03:35)
Continuity mistake: When Brian pulls up in his red pick-up truck, note the distance from his truck to the car in front, this distance is is reduced somewhat when you look in the background in all following shots. (00:04:00)
Continuity mistake: At the beginning of the film when we see Brian and Vince fighting, they are first fighting in front of Brian's truck, then in front of the car, then back to the truck. (00:07:30)
Continuity mistake: When Brian drives up to the street racers meeting in the alley, there is a pipe of some sort hanging from his engine. When he picks Toretto up, it's no longer there. (00:10:00 - 00:24:00)
Continuity mistake: When Brian pulls up in the warehouse alley in his Eclipse look at the car to his left. If it looks like Hector's car with no hood and the same chrome engine and graphics on the windshield, that's because it is. But when Hector says "That's mine." he points across the lot and the car is still next to them. (00:11:55)
Continuity mistake: In the scene where Dom pulls up to the street race with his team, he clearly has indiglo gauges. When the 4 cars actually race, Dom glances at his speedometer, and...no indiglo. (00:12:40)
Continuity mistake: This mistake occurs during the first racing scene between the four guys. It happens after Jesse and Ja Rule look under the hood of Brian's Eclipse. As soon as Brian says 'Am I worthy?' and he is in the middle of his sentence, it cuts to a different camera angle and shows Brian smiling but not moving his mouth while his words are still being said. (00:14:40)
Continuity mistake: On the very first race (in where Ja Rule takes part in the event), Dom (Vin Diesel) is driving a red Mazda RX-7. After the drivers line up on the starting line, Dom lifts up the passenger seat cushion to his Mazda to reveal a nitrous oxide system with a spinning nozzle and two gauges. Immediately after you see Dom spin the nozzle open, the camera does a close up of the nozzle and gauges in the next shot. Note how the gauge frames extended out from the surface (a good distance) then turn completely flat for the close up, even the nozzle gets shifted from one side of the guages to the other. (00:16:00)
Continuity mistake: At the first race when the cars are driving up to the start line to begin, the car furthest ahead is Brian's car (the green one), then it is Ja Rule's car (the red on with the yellow flames), the white car is third, and behind everyone is Dom's car (the red one). When the cars break at the start line, somehow the order of the cars reverses and Dom's car stops first while Brian's stops last and blows over the line. (00:16:18)
Continuity mistake: During the first race scene Brian uses NOS to take over the guy next to him in the red car. You can see Brian taking over the red car, then it cuts to inside the red car, and Brian is taking over it again. (00:18:40)
Continuity mistake: In the race between the four cars, you see Brian after his first shot of NOS pass Edwin, but in the next shot you see him pass the same person again. (00:19:23)
Continuity mistake: During the first race, Brian's cars hood pin wires appear and disappear. (00:19:30)
Continuity mistake: After the street race at the start, Leon alerts everyone that the cops are coming. While everyone is scattering you see a closeup of Brian running around to the door of his car and opening it, then a bird's eye view of his car with no-one near it. Then you see other people running and getting into their cars, then you see Brian run up to his car, open the door again and get in. (00:22:52)
Continuity mistake: At the end of the first race, when Dom enters the parking lot, the first shot we see of the car it is already some distance up the ramp, but in the next shot we see the car has just entered the parking lot and is at the bottom of the ramp. (00:23:00)
Continuity mistake: After Dom parks his car in the garage after the first race, and walks outside, the cop car that comes down the hill is a Ford Crown Victoria. When the cop car turns around in the middle of the street it's a Chevy Caprice. Then again, when Don is being chased through the alleyway and gets big picked up by Brian, the car giving chase is a Crown Vic. When they leave the alleyway it's a Caprice again. Easiest way to spot the difference? First car has wide lights, the second one doesn't. (00:23:20)
Answer: There are two ideas of why the police did not come around. Firstly they might have found out after the car chase that Brian was an undercover cop so it would be more effective to allow him to try and discover information instead of going around and arresting Dom. The other idea is that the police might not have enough to arrest him. Dom was not the one driving when they found him and other than racing, it might be tough to arrest him.
Lummie ★
Cops are usually completely unaware of an undercover cop's identity. The more, realistic reason is that the cop didn't ID Dom and since Brian's car was later destroyed, there's nothing for them to investigate. Afterwards, they might ID Dom, but there's an investigation on him, so they'd leave him alone.