I found it interesting that the season finale (Introduction to Finality) takes place after summer break. Last week's episode (Curriculum Unavailable) takes place two months after being kicked out of school.
This made for some weird timeline issues, much like the episode after the extended break where it seemed like it was supposed to be a new semester. That should have aired in January instead of April. But that has a lot to do with NBC screwing around with the viewing order.