Other mistake: The FBI agents call for a taxi and official transportation from the Evans apartment and gave the address of 963 North Gilbert. However, the Evans lived at 921 North Gilbert. Since the FBI was at their apartment, you would think that they would know the address or exactly where they are in a Chicago project. (00:13:03 - 00:28:29)
Other mistake: JJ says that everybody else in the office just has to look at their watch when the boss asks them the time but he has to go outside down the block because he can't afford a watch. Throughout the whole scene, you can see a wristwatch on his right wrist. He even raises his arm where his sleeve moves to his elbow to show it. It looks like a pretty expensive watch too. (00:05:00)
Answer: Neck Bone is Sylvester and Sweet Pea is Tyrone.
Bishop73
For some reason, I always thought it was the other way around but really no way of knowing. I'm assuming your answer is based on how Florida looks their directions near the end of the episode while saying their names.
They are listed as such on IMDb.com. So it is possible to check. Doug Grant played Sweet Pea and Michael D. Roberts played Neck Bone.
Noman ★