Continuity mistake: After the prologue, you see the Montague boys in the yellow car. If you look at the Montague sitting in the back of the car, you can see that his sunglasses are on his forehead; a few seconds later he puts the glasses down over his eyes. In the next shot, his glasses are back on his forehead again.
Continuity mistake: In the gas station at the beginning, when Jamie Kennedy is singing "A pretty piece of flesh I am", watch his shirt. When he is first walking forward it is buttoned, then, in the next shot, it is open when he is licking his nipple. It's too quick a shot to have unbuttoned it.
Continuity mistake: Tybalt's tattoo changes constantly. When he's watching Mercutio dying on the beach, it's a plain simple heart on his chest. When Abra is forcing him to run away to his car (in the same scene) it is not there at all. Then when Romeo is chasing him in his car and Tybalt's car rolls over, as he crawls out, it is much more intricate, with black lines and fire. It also changes when he gets shot over the fountain.
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.
Continuity mistake: When Romeo and his friend drive to the church where Juliet lies. You see that their car is very dirty. But when they arrive at the church the car is all clean. It seems a little strange to clean the car, when they have to hurry, and he was wanted by the police.
Continuity mistake: When Tybalt and Romeo fight (just after Mercutio's death) watch Romeo's shirt closely. It is at first dirty and covered in blood then when Romeo is looking up to the sky after shooting Tybalt the shirt looks cleaner with only a few blood stains on it. Also watch the wounds on Romeo's face, the amount of blood on them changes too.
Continuity mistake: At the end of the film Juliet/Claire Danes lifts the revolver to her left temple, in her left hand. After firing the shot and landing, her arm has already fallen before she has.....she lands in an odd position assuming the angle the gun was pointed at, and the original position of her arm.