Deliberate mistake: When the scanners escape the apartment in the van and the assassins are in pursuit there is a street view shot of the assassins driving up next to the scanners' van. If you watch the street on the right side of the screen you can see people stood watching the filming in groups, out of harms way. (00:50:28)
Scanners (1981)
1 deliberate mistake
Directed by: David Cronenberg
Starring: Patrick McGoohan, Jennifer O'Neill, Lawrence Dane, Stephen Lack
Visible crew/equipment: In the scene where the bad scanner is trying to kill the good one using the telephone line, when the good guy turns it back and blows up the office/lab at the other end, one of the scientists is blown back through the glass by the explosion. In the shot from outside the room, it is easy to see the cable pulling him back. (01:22:55)
Darryl Revok: This was a test campaign used in 1947 to market a new product. The product was a drug, a tranquilizer called 'Ephemerol'. It was aimed at pregnant women. If it had worked it would have been marketed all over North America. But the campaign failed and the drug failed, because it had a side effect on the unborn children. An invisible side effect.
Cameron: It created Scanners.
Trivia: Scanners is identified as having the first known media depiction of psychic activity directly or indirectly causing nosebleed. This concept has since become widespread in movies, television, and comic books/graphic novels.