During one of the scenes taking place in the Stock Exchange room, a huge clock can be seen displaying "VEN(erdi)" "21" "LUG(lio)" "13:09". It corresponds to Friday July 21th (1961), the real date when it was filmed on this location.
Piero's car is stolen and driven into a lake by a drunk. The lake is called "Laghetto" (small lake in Italian despite its big size) in the EUR Zone of Rome. At the background of the shot is a curtain-wall like skyscraper office building under construction. It is Palazzo Eni, future headquarters of Italian multinational oil and gas company ENI. The landmark building was under construction at the time of filming around 1961 and was completed in 1962. It is currently the third tallest building in Rome at 80 meters tall and has 22 floors.