Parts of this episode were filmed on location in San Francisco. Fisherman's Wharf and the now closed federal prison on Alcatraz Island were a couple of the city's most famous locations that were used for filming.
The police helicopter that landed at Alcatraz during the last minutes is an early model Hughes (now MD) 500 (model 369). The earlier versions have a "V" shaped angled stabilizer whereas the later models have a straight horizontal stabilizer.