Visible crew/equipment: Martin Brundle (in fly form) manages to kill a guard by spewing acid vomit all over him. Right after this happens he roars and you can see what looks like a colander (probably used to increase the spread of the vomit) in his mouth.

The Fly 2 (1989)
1 visible crew/equipment mistake
Directed by: Chris Walas
Starring: Eric Stoltz, John Getz, Daphne Zuniga, Lee Richardson
Revealing mistake: When Beth is helping Martin out of Bartok's cocoon, you can see Martin wearing pants inside the cocoon. Surely he should be naked. (01:35:15)
Beth: You can't walk... and you're getting worse.
Martin Brundle: I'm getting...better.
Trivia: At the end of the movie, the mutated Bartok was played by director Chris Walas' brother Mark.
More questions & answers from The Fly 2
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Chosen answer: They were studying the mutation. It was cruel to keep the animal alive, but they didn't care about that.
wizard_of_gore ★