Instead of simply losing his job, Kessler would have been immediately arrested and charged for planting evidence.
At the end of the film, Warren is distracted by the transmissions on the police radio while searching for Laurie. The radio was given to Laurie by McAnn long before Warren is arrested for murder. Yet she still has it after his trial, when there is no reason for her to keep it following the arrest as it a tool to contact McAnn should Warren make another obscene call to her. Furthermore, no charging device is given with the radio, so the battery would have long been flat. It is highly likely that a property officer at the police station would also have noticed its absence for such an extended period and would have questioned McAnn as to its whereabouts for inventory purposes.
Blood on Warren's naked body keeps appearing and disappearing and appearing in different parts at climax of the film.
When Warren gets arrested by Leo Kessler, he is stark naked. When all the police cars arrive, Warren is wearing black underpants.
Just before Warren is shot in the head, his hair is messed up from running. When the bullet hits him, his hair is neatly parted with his forehead totally exposed.
When Bronson is walking to his kitchen at night, he crosses in front of a well-lit, out of frame window. Clearly visible in shadow form is the head of a crewmember wearing a baseball cap.
When Warren is chasing Betty through the woods, he's wearing pants while running in some shots.
Near the beginning of the movie while the two detectives are driving down the road there is a white Dodge van behind them. In a moment it passes them. A moment later the same van is again behind them.
At the end of the movie, McCann pulls up in a beige car. After Kessler shoots Stacy, the camera pans out and now there are black and white police cars everywhere and McCann's beige car is nowhere to be seen.
When Leo and Paul drive away from the Johnson's house you can see the crew members standing and sitting around.