Details for the script:
Harold's watch is blue. Global zoom at beginning. The script would call for the narrator to sound like a Limey. Harold Crick must tie his tie in a single windsor knot. He must wear a suit. Harold Crick's tooth brushing technique. Harold's walking pace. Which bus Harold catches to work. The location. The time of day. The setting. The cold, sleek, generic city in the background.
Details added in direction:
Harold has a briefcase. Harold wears a black suit without stripes. Cars stop for Harold, while he's in the crosswalk. The tie Harold wears. The nifty effects that show the numbers. Harold's overcoat. The cubicles at Harold's work. The layout of Harold's apartment. The apple Harold eats for breakfast. The magazine of financial calculators that Harold looks at while on his lunch break. The background noise at Harold's office.