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)
Suggested correction: Petrol is a liquid and as such it will run down from the top as well as the splashing of him pouring it. It will all go up instantly same as if you petrol to start a bonfire.
Continuity mistake: In the first film, Vince gets his arm caught up in steel wire while hijacking a lorry. We then see he has scars up his arm. However when we first see Vince in this film the scars are no longer present. They then show up again inside the house.
Suggested correction: When Brian and Mia first arrive at the Favela's, you see scars on Vince's arm as he greets them and goes back up the steps. (00:04.20).