When Mark Kaminsky goes to the Industrial Site to stage his death, the driver's side window is closed and once he uses the bolt cutters to open the gate to drive through, the window is now open. Once he has parked the car next to the fuel line the window is again closed.
In the fist fight in the womens dress store Mark punches someone who can clearly be seen wearing a plaster on his head, next time the camera is on him it has come off and then re-appears when he is on the floor.
After the fight in the alley (3 against Kaminski), the police car pulls up and screeches to a halt. After the conversation with the police officer, the police car is sitting at a different angle, with both headlights visible instead of the driver's side one blocked by the cardboard boxes in the alley.
At the 35 minute mark, Rocca introduces Joey to Max during a conversation in the office and the position of Rocca's left arm changes when he tells joey that Max takes care of things (all kinds of things).
Towards the end of the movie, Petrovita's car is "heading south on Route 84". Earlier, Kaminski tells Monique to go to the Rock Falls Airport and charter a plane. Route 84 in Illinois runs from Wisconsin to the Quad-Cities. Even assuming he drove all the way to Wisconsin to take that route, it never goes to Rock Falls.
In the final shootout, an errant round strikes a revolving light fixture causing the party lights to start working. Unless the switch to the lights was flipped, the party lights should have stayed off.
In the shootout at the end, when the elevator descends and the mobsters shoot at the closed elevator door, the door then opens, but all the bullet holes in the back wall of the elevator have been made from outside to inside, not inside to outside as they would if the bullets had passed through the elevator.
When the team sent in to rob the police station of seized narcotics detonates a charge to break a safe, the sound can be heard at street level. Considering that the vault is below street level and ensconced within a concrete basement, it should not be audible at street level.