Audio problem: When Vince turns up at the BBQ he sees Brian and walks off - Dom shouts "Vince, give us a hand" and he replies "looks like you got all the help you need, brother" - his voice doesn't match his mouth.
Continuity mistake: When the first street race takes place with the four cars, it is evident that the race takes place along a straight stretch of road. However, when the race finishes, everyone who was at the start line just a minute ago has magically appeared at the finish line, miles down the road.
Chosen answer: It's a car with the power to do a quarter-mile drag race of the type depicted in the film in ten seconds.
Tailkinker ★