Visible crew/equipment: On the DVD, when the Capulets are jumping back into their blue car at the end of the gas station scene, look at the rear passenger window. A microphone boom is plainly visible in the shot. (00:07:21)
Visible crew/equipment: Near the end when Romeo is having a shootout with the police at the church, look closely at the door to his right. There's a bit of wiring or something there. An officer fires a shot toward Romeo and you can then see that the wire is actually the flare/effect for a bullet hitting the door. (01:40:00)
Visible crew/equipment: Just as Romeo is about to leave the courtyard after his antics in the pool with Juliet, he turns around as she calls him from the balcony to give him her necklace. As he turns quickly look above Romeo's head, the boom mic quickly pulls out of the shot.
Answer: A lot of the cars can be found here - http://www.imcdb.org/movie.php?id=117509.