Revealing mistake: When Brian's car explodes after being shot up you can see the air cannon when the car goes up in the air.
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.
Chosen answer: It's not a real program, just some CGI. As well as when the pictures of "what it could look like" show up. Those are existing pictures of the car.