The drive-by shooters who shot up Janila's house used automatic weapons: machine guns. However, police are shown picking up red shotgun shells from the living room floor inside the house. Machine guns don't have plastic shell casings; even if they did, they wouldn't be inside the house, but rather on the street where the weapons were fired.
As Cooper drives away from the convenience store robbery, the type of street they are on changes in just a few seconds although he never turns; at first it is a one-lane residential street, then it is a wider street with businesses, and finally it is a three-lane thoroughfare with tall buildings.
when they saw the robbery in progress at the convenience store, Ben who is sitting in the back seat gets out first. police cars don't have handles in the back seat so criminals can't escape. back seat of police cars can only be opened from the outside.