* BillingDisplacement: Top-billed Jennifer O'Neill doesn't appear until the 37 minute mark and is more of a supporting character to Stephen Lack's character. Creator/MichaelIronside is billed fifth despite arguably playing the most memorable character of the film.
** In ''Scanners 2'' David Hewlett plays David Kellum.
** From the credits of ''Scanners''
--> Assistant to Mr Heroux.....Kim Obrist
* RealitySubtext: A drug marketed to pregnant women as a painkiller that turns out to cause strange deformities in their unborn children; ephemerol bears an eerie similarity to the real-life scandal in the late 1950s as women who had taken thalidomide during pregnancy (marketed as relief for morning sickness) began to give birth to children suffering phocomelia or other physical deformities.
* RomanceOnTheSet: Christian Duguay, the director of ''Scanners II'' and ''III'', married Liliana Komorowska, who played Helen in the third.
* TechnologyMarchesOn: The very ''idea'' that someone could intrude upon a computer system via its connection to the phone lines seems to be an alien concept to ConSec's security director. He and the ConSec technicians ponder aloud exactly how it might work, presumably because audiences in 1981 would be equally confused by the notion.
* WhatCouldHaveBeen: In the original screenplay, the protagonist's name was going to be Harley Quinn (note that ''WesternAnimation/BatmanTheAnimatedSeries'' did [[NamesTheSame not exist yet]]) and he was going to be a [[VillainProtagonist much darker character]] than Vale - it was going to start with him [[MindRape Mind Raping]] a woman in a subway on purpose, as opposed to Vale's accidental crime in the opening scene of the completed film.
* WritingByTheSeatOfYourPants: The first film was written like this, which was forced upon Cronenberg because of the way the production had to be structured due to financing reasons. There was virtually no pre-production, so he had to start shooting with an unfinished script. He would write in the morning, and film the rest of the day, mostly out of order. On top of ''that'', they often had to drive around at random, looking for places to shoot scenes. So literally ''everything'' about Scanners was done by the seat of their pants. He talks about it at some length in ''Cronenberg on Cronenberg''.
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