After shooting out the tire of the big rig, the two sons stand in front of it and fire more rounds than their shotguns can hold without reloading.
At the beginning of the movie when Joey is on the CB he says "breaker 1-9" when the CB is shown to be on channel 18.
The character "Sly" is credited as being a lieutenant. When he is talking to Mahoney at the station, he opens a door that says "Lt. S. Sullivan" and goes in and sits at the desk, indicating this is his office. His uniform jacket and shirt have three stripes on the right sleeve, indicating his rank is that of sergeant.