Other mistake: Keith tells Veronica that Woody's password is "mrgoodwood." When she types it in, 11 characters are entered, but the password is only 10 characters long. It can't be a "." because Mac OS doesn't use that character in passwords.
Continuity mistake: When Veronica gets the SMS about Aaron's verdict, her hands switch around from being below to above the desk.
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.