- The scene where Bruno Lawrence is aimlessly wandering the empty streets of the city blowing on a saxophone was an in-joke to those who knew him, as he had once stolen one when he was young, but later felt guilty and returned it.
- The vehicle that Joanne (Alison Routledge) steals when she goes after Zac and Api is a Holden Torana LJ (1972-73).
- The white Toyota Hilux pickup truck that Zac drove was one of two brand-new 4wd trucks that Toyota of New Zealand gave to the production.
- The air crash was filmed at an abandoned fertilizer factory.
- Producer Sam Pillsbury's sister was responsible for trucks and other vehicles and setting them up the crashes that Zac sees.
- Cameo: [Sam Pillsbury] At the auto accident scene, the man lying on the hood of the sedan is the producer.
- Pete Smith (Api) was a former juvenile delinquent. The Quiet Earth was not only his first acting job, it was his big break. He has been an actor ever since.
- The Quiet Earth is actually based the one experience of an American tourist in New Zealand in the 1970s. New Zealanders always take the weekends off and sleep late. The tourist arrived in the center of Auckland on a Sunday morning and found it completely deserted. He later said he felt like the last man on Earth.
- When Zac checks in at work he hits a few buttons and the monitor starts buzzing and repeatedly displays the words, "Response....Negative." He is signaling all other stations in the worldwide grid to see if they are manned. The negative response tells him that everyone is gone in those countries, too.
- Zac calls the energy grid, "Project Flashlight". Ironically enough, there was an American defense project called "Operation Flashlight" around the same time as the film. The operation, however, involved low-yield atomic blasts, small enough to destroy a single room, but nothing else.
- When lying on the hood of the car, Producer Sam Pillsbury lined up all his credit cards beside him as a macabre joke. The meaning was that he was killing his personal credit by charging all the film's expenses.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: Each of the survivors had a near-death experience due to a different cause. Zac was a suicide, Api was a murder victim, and Joann a victim of accidental electrocution.
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