Revealing mistake: Dom pours petrol over the money to make a point to Reyes. When he does, he pours a small bit on the top and chucks the can away. When he throws the lighter, the entire mound goes up instantly. Even areas with no petrol, and nowhere near the lighter. (00:47:05)
Continuity mistake: When O'Connor blocks the bus on the two-lane highway with his vehicle, the bus swerves around his car towards the shoulder, clips the right rear of the car, and breaks the vehicle's rear window. In the next shot, the bus reverses angles, flips over the left rear of O'Connor's car nearest the center line, becomes airborne, and then rolls over and over down the center of the highway. If it had continued on its initial trajectory, it would have crushed his vehicle and continued onto the shoulder. (00:01:45)
Revealing mistake: Reyes shuts the safe after putting a price on Brian and Dom's heads. We see him close the safe from a camera angle inside the safe. When the safe is shut there is a light reflected on the inside of the door that can't be coming from anything that's known to be in the safe - must be the camera or similar. (00:55:25)
Continuity mistake: In the scene where Hobbs confronts Dominic for the first time at the location where all of the drivers go to race, Hobbs and everyone he is with aim their guns towards Dominic. Officer Neves pulls her gun out as well but when the shot shows the whole group and Dominic says "This is Brazil!", Officer Neves has both of her hands at her sides. Right before it cuts back to her, you can see her start to reach for her gun. But the next shot shows her holding her gun out already, not just pulling it out. (01:11:00)
Other mistake: In the final chase scene with the vault when Brian is in reverse and Dom is pulling, Brian stops to take out the two bikers. The vault stops too but in Dom would still be pulling it since there was no communication, plus the inertia of the vault would have dragged Brian or smashed Dom.
Revealing mistake: When Neves is driving Hobbs' reinforced 4x4 and Vince is talking about his son Nico, Look through the windscreen and the background is the same shot constantly. It's them driving past a telegraph pole towards green trees that never get closer despite driving down the same road for nearly a minute at speed. (01:33:30)