The montage of the Los Angeles cityscape at the start of the show includes a billboard for the previously canceled Studio 60 on the Sunset Strip (2006).
In the flashback to when Brandon kills Felix, we hear Felix say "Brandon, what's going on? You sick bastard," but his lips aren't moving.
Jane goes looking for a valet ticket because the victim didn't have any car keys and "nobody walks in LA", so he looks to the bystanders and hundreds of people walking past.
Apparently he and the police officer he is talking to have also never heard of taxis.
When the agent is telling the staffer that it is a closed set and nobody should enter, Lisbon flashes her badge upside down.
When Rigsby finds the drugs in the victim's vehicle and picks them up he is not wearing any gloves. This would ruin any latent prints or DNA evidence, which no experienced law enforcement officer would do while searching or collecting evidence.
It is completely illegal to arrest somebody on drugs possession charges for claiming that the drugs that aren't in their possession belong to them. Especially after watching somebody else crush the pills and they've admitted to using them "for creativity".
While sitting in the interrogation room being asked questions Sydney asks if she can go and was not allowed to leave. She was not under arrest so she should have been allowed to leave if she had wanted.