Continuity: Shortly before Sol's death, Thorn rushes into the suicide center and talks to him from the control room above. When Sol pleads Thorn to listen, there's interference on the intercom. Now watch the control panel: The earphone cable on the left side dangles back and forth each time the "speaking permitted" sign flashes on and off, blatantly revealing the cheap trick they used to make the display flashing - they simply toggled the "on" and "off" frames.
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Trivia
This was Edward G. Robinson's last film. See more...
Soylent Green mistakes
Continuity: When Thorn goes back to Simonson's apartment to see Shirl, he interrupts a party. Shirl is holding a drink which contains huge ice cubes, but right after the two of them go into the bedroom the ice is no longer in the drink. Way too fast to have melted.
Revealing: The sliding door to the bedroom in Simonson's apartment appears to be covered with a sheet of 'bubble wrap' in early scenes of the room.
Soylent Green trivia
"Soylent" is a mixture of the words soy and lentil.
This was Edward G. Robinson's last film.