The office scene (the first shots of the film) took place at One PPG Plaza. A day before shooting, security decided to cut the originally allotted time from 8 hours to 4 hours. Regardless, all shots were taken, and cast and crew made it out of the building on time.
After filing on two separate occasions, at the time of shooting, none of the Pittsburgh permits were honored. All Pittsburgh city shots were "stolen", often with 6'5", 210 lb., DP (Randy Beightol) jumping into the open door of the Corvette as the facility security people would chase the crew off location.
The Corvette in the movie, belongs to Harry Gerhardt ("Greys") after the originally scripted and secured Porsche Boxter was withdrawn less than a week before shooting.
With actual footage to prove it, during the same day of shooting, and standing in one place (outside the Wilhelm Winery location), the camera was tilted 180 degrees- 72°, clear, and blue skies on one side to 36°, grey, and snowing sideways on the other- typical NW PA weather.
Jhonnie Marie Sims ("Sara Marsh") was not prepared as the police and EMS were told to treat her first as an armed assailant, then as a gunshot victim.