In Scenes 38/39, where Stanley watches himself from outside of Moira's window, Best Boy Electrician, Steven E. Kolar, doubled Richard Neil.
The budget was too small too afford a rain machine, so several crew members squirted water from two garden hoses into the air to simulate the rain in Scenes 38, 39, 40.
Rimini Italian Restaurant, the location for the scene where Stanley "has lunch" with Moria, closed several months after the shoot when the owner was caught buying US$18,000 worth of cocaine from undercover officers.
Short on extras, Producer 'Fred Kaplan' drafted his parents, Vivienne and Hyman. They're the older couple that gets on the bus with Moira.
Unable to use a dolly to shoot Stanley breaking into Moria's house, Cinematographer Lloyd Freidus held the camera while riding in a wheel chair that a dolly grip pulled.