Danielle Harris was quite nervous about shooting the table-dance scene (which actually doesn't appear in most TV versions), so she asked if she could choose the people who are sitting at the table. She picked the boys who would be most uncomfortable watching her as to make herself more comfortable while performing.
When Alexia answers the Chemistry question in class, she writes "ABC" on the whiteboard. In the next shot as she continues writing, the appearance of "ABC" is completely different.