When Jamie arrives at Vince's house with Turtle's gift (a new Porsche) and she finds out he already got a car from Vince, she says "Well, you deserve everything." This shot is correct, but then after a quick cut to Turtle and Jamie you can see Jamie's mouth is still moving but this time without voice (she probably says the same line again).
Vince can not drive, he got his driver's license just two episodes back (by actually failing the test miserably), now he is driving a race car like a pro.