In the police station during discussion on how to get the gun back, Detective Ronnie Gardocki is throwing darts, two land to the top left of the number 2 on the board, when the camera flicks back, one of the darts is directly under the number 2.
Lem is sitting on sofa with Tigre. When he quickly stands up, camera is visible.
You can see cameraman inside the car when Vic Mackey, Curtis and Ronnie are about to rob the evidence and between the takes of Vic shattering the van glass.