Audio problem: When Vinny questions Lisa about the photograph of the tire marks, the soundtrack has been changed to the opposite of what she actually says. When her lips say "left" we hear "right" and when she says "right" we hear "left".
Audio problem: When (Mona) Lisa goes storming out of the cafe, from Vinnie's sarcastic outburst over the photos, a hum scraping is heard from the wheel track the camera is on, as it closes on Vinnie, followed by a very faint audible 'All right' from the camera guy or director.
Audio problem: After Vinny questions the old lady about her glasses, he walks back to the desk and high fives his fiance. Their hands don't touch but still produce a slap.
Chosen answer: The judge is trying to ensure that Vinny will provide a competent and zealous defense for the boys, and not make a mockery of the courtroom procedure he loves so much. Since Vinny knows that six weeks of civil law practice, and zero courtroom time will not convince him, he lies.
troy fox