* {{Defictionalization}}: You can actually find Soylent Green crackers out there, though it's not really made of people. (Or so we hope...)
* EnforcedMethodActing: Heston during Sol's "going home". (Robinson had privately told Heston that he was actually dying of cancer. This was Edward G. Robinson's last film; he died (of cancer, of course) soon after it was made.)
* HeyItsThatGuy
** [[Series/StarTrekTheOriginalSeries T'Pau]] as the Exchange Leader
** Dick Van Patten of ''Series/EightIsEnough'' as an [[spoiler:assisted suicide attendant]]
** You could say [[Film/TheTenCommandments Moses and Dathan]] are together again.
** [[Film/StarTrekIVTheVoyageHome Admiral]] [[Film/StarTrekVITheUndiscoveredCountry Cartwright]] is a police captain. Or is it [[Series/StarTrekDeepSpaceNine Joe Sisko?]]
* RealitySubtext: Edward G. Robinson was really dying from cancer during filming. Thorn's tears are Charlton Heston's real tears during the assisted suicide scene.
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