Both detectives draw their service revolvers in the back room of the bar before confronting Benesch. But when they enter the bar, the guns are back in their holsters and they unclip them again.
When Madigan is interrogating Hughy in the theatre Don Stroud's long strangely hair combed across his forehead changes with the different angle shots, the wispy dangler comes and goes and then his bangs are suddenly well combed at the end of the scene.
When the killer is located in a hotel room, the police mass in view of the window rather than around the other side of the building. Then while the killer is firing from the window the assault group run into the building on the side under fire from the window. They evacuate the floor of the killer's room well after the first shots are exchanged and no police are watching the door to prevent escape.