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?
wizard_of_gore
19th May 2014
The Fly (1986)
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Suggested correction: Just because a character doesn't do something that they probably should/could have, it doesn't make it a plot hole. It's arguably a character error.
The correction makes no sense. If the teleporter included the fly's DNA, it would also have included the DNA of - literally - trillions of bacteria, viruses, mites, etc., etc., that are in and around Seth's body. You cannot have it both ways.
How about this then: the bacteria and microorganisms on a body are, by their name, microscopic. Brundle could've accounted for that by programming the computer with something like "If detected organism is under (specific size), treat as part of the primary body/template," so the computer would thus not remove or alter those organisms. The problem with the fly is it's large enough to be a separate, macro-sized entity which Brundle didn't account for and the computer had no instructions for.
As has been noted elsewhere on this site, making up deus ex machina explanations for errors in films does not invalidate them. The posting, and others like it, is absolutely correct.