Continuity mistake: When Romeo is talking to the Capulet father at the party, his mask goes up and down.
Continuity mistake: Just before Romeo and Juliet jump into the swimming pool, Juliet's hair is in a braid that wraps around her head. But, when they jump into the pool the braid is gone.
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.
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: During the scene where the Montagues enter the Capulet mansion, watch the chain linking Romeo's armour on his back. At first it is attached, and then it is broken, then later attached again.
Continuity mistake: Romeo has just come up from under water, where he was hiding from a guard. His hair is untucked and messy. In the same scene seconds later it is combed back behind his ear and smooth.
Continuity mistake: Immediately before Romeo comes into Juliet's room, Juliet is looking at her religious statues, and you can see her right cheek is wet with tears. When Romeo comes in and Juliet turns around to see him, her cheek shows no signs of tears, nor after that.