Pacey was punched in the eye. It was swollen shut, and he had a cut above his eyebrow. But suddenly it's just gone.
Nellie is in Pacey's English class, so you would assume she's also in the 10th grade. However, she is also in the film class that Dawson wants to be in, that the teacher would not let Dawson be in since he is only in 10th grade.