Awesome Music: Every. Single. Episode. The editors have managed to make walking through a room be cool. Sadly, some of the music from the broadcast version was replaced for the web and DVD releases.
Complete Monster: Roman Nevikov is a ruthless Russian mobster and human trafficker. Responsible for kidnapping countless women to force them into prostitution, his first appearance involved him tossing one out a high story building to her death because she wanted to leave. Later returning, he places surveillance on the FBI building and has the people who helped him with that killed off. Finally, after escaping from prison, he tortures to death Jack Reese and kills off some of the FBI agents who work for him to cover his tracks. Through his cruelty, Nevikov earned his place as the Arch-Enemy of Detective Charlie Crews.
Critical Research Failure: Charlie repeatedly states early on that he was in a "maximum security federal penitentiary" but it's later shown he actually went to Pelican Bay, a state prison. The crimes he was convicted of were all in state jurisdiction too. He may have been deliberately exaggerating, though.
The Danza: Charlie's ex-wife, Jennifer Conover, is played by Jennifer Siebel.
Fridge Brilliance: Why does Crews love fresh fruit so much? He didn't get such treats in prison. Some fans thought this was the case before the show confirmed it in the ninth episode.
Idiot Plot: From time to time cases will be based on someone acting unusually stupid.
In "Black Friday", Charlie, Dani and Bobby are examining a crime scene at a mall just before opening. When they realize the security guard is opening the mall on time anyway, all three rush off to prevent the doors from being opened, specifically to prevent the crime scene from being disturbed. Naturally, when they get back, the body is missing.
The second episode (with the murdered bride) could easily have ended with the case solved in about 10 minutes - all the witness, Tiffy had to do was mention to the 20 or so cops in the room that she saw the murder and she would have been safe.
To be fair, she was hungover and she'd seen her brother kill her friend. She wasn't in any kind of state to make sensible decisions, especially once her brother got back to her.
Nightmare Fuel: The killer in season two who was so obsessed with being happy that he locked five people who were all about to be happy in boxes and left them to suffocate, in specially-chosen locations that formed a giant smiley face on a map.
Bobby's wife also earned some for her Moral Myopia. Because apparently having other cops distrust her husband for being Crews's ex-partner is somehow Crews's fault even though Bobby's testimony was part of what got Crews in prison—oh, and she also seems to think that that distrust is somehow a worse ordeal than twelve hellish years of prison for a crime you didn't commit.
Catharsis Factor: Seeing Manami get pursued all over school and cornered when she climbs on top of the shoeshelves, where the whole student body starts demanding that she apologize in front of everyone for everything that she has done. After all the stuff she's pulled, she gets a certain amount of comeuppance, and it's beautiful to see.