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.
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.
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.