Chen and Bradford's call sign is 7-Adam 19, but when they're called to an outdoor paintball club, dispatch calls them 7-Adam 15, which is Nolan and Bishop's call sign.
When Nolan is talking with his young attorney, his attorney says he "passed the bar on his first try with a near perfect score." In California, scores are only released for those who fail the exam. Those that pass never learn what their score is.
Allowing her boyfriend to be defense attorney when she is arresting officer, puts Officer Lopez in a position where she could get fired for misconduct, due to conflict of interest.