Continuity mistake: At the end of the episode, Veronica knocks on the door of room 6, implying that it was empty. In the next shot, we see under the sign for The Camelot, it says "No Vacancies" meaning Lianne could possibly be there still.
Continuity mistake: The morning after Veronica is raped, she readjusts her dress' strap on her left shoulder. In the immediate shot after, the strap is down again. (00:22:00)
Answer: 1. No, the pep squad uniform was green and yellow. 2. He failed one of the classes, the one where they were trying to launch an egg from various heights without cracking the egg. He was pairing with Angie Dahl, who told the teacher that he didn't do anything in the project. The teacher then asked him to pick the project he worked on, and he couldn't do it because he didn't help. Then the teacher told him, "See you in summer school." He couldn't graduate with everyone else because he needed to attend summer school in order to pass that class and graduate. It's assumed that he did, in fact, attend summer school, despite all the mess that happened in the season 2 finale.