In the prom scene at the end of the movie, Nicole (Melissa Joan Hart) arrives with Ray wearing several hoops and 2 studs in her left ear. For all the following scenes she is only wearing the two studs. Oops!
Well no actually, if you look at it closely, she is not in fact, wearing hoops as she enters. Her hair is just a bit dang-ely, so it might look like it's hoops, but it is just studs she's wearing, throughout the whole dance.