When Carmady shoots the man in the parking garage elevator, he falls over backward into the elevator. Next time we see him, he has fallen forward, face down, with half his body out of the elevator.
Toward the end of the movie, Chandler and Katherine are running out of the nightclub thru the kitchen door. They bump into a chef (chef's hat) carrying a tray with one hand full of empty dishes.
When Carmady shoots the man in the parking structure a loud report can be heard from inside the car; yet when Kincaid shows up, and Carmady hands him the gun it has a suppressor on the barrel of a revolver. Which anyone knows does not suppress the blast.