Visible crew/equipment: During the party, Deb and Hilly join Gary and Wyatt in the bathroom, and when the boys step into the shower enclosure and close the glass door, a crewmember's moving reflection is visible on the shower head.
Weird Science (1985)
1 visible crew/equipment mistake
Directed by: John Hughes
Starring: Bill Paxton, Anthony Michael Hall, Kelly LeBrock, Ilan Mitchell-Smith
Revealing mistake: When Gary and Wyatt come home and see Chet turned into a pile of poo, Chet shoots his tongue from his mouth and catches a fly. Look closely, the tongue flies completely out of his mouth and is attached to a metal spring. (01:24:55)
Wyatt: By the way, why are we wearing bras on our heads?
Gary: It's ceremonial.
[Later, after Wyatt talks to Chet, Wyatt begins to leave the kitchen and Chet sees him wearing women's underwear.]
Chet: Like your panties.
Wyatt: [walking back into kitchen] It's a joke, Chet. Really.
Chet: No. That is not a joke. That is a severe behavioral disorder. Next thing you know you'll be wearing a bra on your head.
Trivia: When Gary is first telling Wyatt of his idea to make a woman, Wyatt asks,"What about your girl[friend] in Canada?" a reference to Anthony Michael Hall's character in "The Breakfast Club." In the Breakfast Club when Bender is asking Brian if he is a cherry, Brian says that he had slept with a girl from Canada that he met at Niagara Falls. (00:07:00)
More questions & answers from Weird Science
Answer: According to the Wikipedia page for this movie, Lisa transforms Chet into a giant, talking turd.
Casual Person