When Steve calls information to be connected to Dale Porterhouse at Stokes and Whitney; he gives his pager number to the receptionist, he then sets the prop phone down on the table without pressing the button to hang up the call. The type of handset used has a button to place and end calls.
When Steve pulls into the parking lot at the grocery store, he opens the door and picks up the melon off the ground. He does not close the car door, but after he puts the melon in the garbage, we see the door is closed.
When Everett is speeding on the highway past a rental bus on his left headed to to the governors house he runs along the guardrail creating large sparks from the collision. Later in the chase, after avoiding the pursuit vehicles, he spins his Mustang around and there is no damage whatsoever to the right side of his car.
The crime the plot centers on takes place in Richmond, in Contra Costa County. The prosecutors Everett tangles with in an effort to free the condemned man are at the Alameda County Courthouse in Oakland. A murder in Richmond would be tried in Superior Court there or at the Contra Costa County seat in Martinez.
When the execution begins, the prison guard reads an order saying that the defendant was convicted in Alameda County Superior Court. The crime took place in Richmond, California which is located in Contra Costa County. Therefore the order would come from the Superior Court in Contra Costa County.
Everett drives from Oakland to San Quentin more than once on the same day he takes his daughter to the zoo. Given the traffic conditions in the Bay Area and the 30 miles or so from the Tribune building to the prison and the bureaucratic hassles of visiting a prisoner, the time line becomes highly suspect.