The film is set in San Francisco, but actually filmed in Pittsburgh. They used Grant Street in downtown Pittsburgh because it is a brick road like many of the roads in San Francisco. Also the front of the hospital is really One Mellon Bank Center located on Grant Street, the same building in the helicopter scene of Jean-Claude Van Damme's Sudden Death (1995).
In addition to some of the scenes filmed in Pittsburgh, an elaborate set was constructed in a vacant hangar at what is now known as the San Bernardino International Airport, what used to be Norton Air Force base. Both the jail/prison was three stories high and the hospital, built to the same level, were both physically connected by the concourse seen in the movie.
During the car chase, a police unit radios 'I have the blue '89 Ford pickup eastbound on Van Ness'; however, Van Ness Avenue in San Francisco is a principal north-south street.
When Conner is helping a shot officer shot in the arm, the officer's shirt is open showing a stomach wound and his white t-shirt with a big blood stain. In the next shot, the shirt is buttoned and we see his uniform is navy blue. His open shirt is seen in next shot as he is on table being examined.
When Pete was on the computer towards the beginning of the movie you can clearly see that there is only one cord plugged into the computer. So that means that the mouse wasn't plugged in or the keyboard wasn't plugged in, when he was using both.