Plot hole: In any given volume of air, there are any number of tiny, living organisms; dust mites, viruses, bacteria, etc. Why did the teleporter combine Seth's DNA only with the fly that was in the chamber? If he had taken the "floating organisms" into account in his calculations and programming, then why would he not have excluded ALL foreign DNA?
The Fly (1986)
Ending / spoiler
Directed by: David Cronenberg
Starring: Jeff Goldblum, Geena Davis, John Getz, Joy Boushel
Jeff Goldblum once again goes into the teleport machine. He comes out transformed into a hideous creature. Geena Davis blows his head off with a shotgun.
Cronenberg
More mistakes in The Fly
Tawny: Are you a body builder, or something?
Seth Brundle: Yeah, I build bodies. I take them apart, and put them back together again.
More questions & answers from The Fly
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Chosen answer: I think it was a chip from an old-styled electrical device, like a computer.
kh1616