I agree that the guy playing Nolan's brother was odd. I didn't think his acting was particularly good, and several times I felt he was struggling not to look at the camera. I didn't know who Pete Davidson was before reading these comments, so i thought he was the guy from Jackass trying to make it as an actor.
I also don't like how Nolan is turning into everybody's hero. I know he would grow and learn and still wouldn't be a green Rookie, because the learning curve is fast, but he is starting to act like some of the well seasoned officers. I almost feel like they are doing these ridiculous storylines because he has nothing left to learn, just experience, and I think that is a mistake. I think the writing for Lopez and West is better because he will toss out ideas and she will say "No, because XYZ." I doing think the Bradford and Chen have chemistry, but I don't want to see them together. It's too easy and predictable, and I like Bradford's current girlfriend. They compliment each other well.