The movie was never released theatrically, due to the filmmakers running out of money to secure distribution. It was not until 2007 that the original film, not the 1979 re-cut version, was finally released on DVD.
Feature film debut of Jarred Mickey as "Andrew Moore" and Jennifer Warren as his wife "Erica Moore."
Footage from Swop (1969) was later re-edited into a completely different film, known as both The Swap (1979) and "Line of Fire," in which a man investigates the death of his brother (released 1979).
The found love letter is translated as: "Dearest, my heart is heavy with love. We are not equal, you and I, to the sum of our love. When you left, I spent long hours in front of the mirror, waiting, and watching the time take away my glow. My breath is strained without you. Hurry, my love. Blanca"
This is Robert De Niro's second career film, having his feature film debut the previous year in Ciao America (1968).