Continuity mistake: After Lisa's creation, in the car Wyatt's left hand is resting on the back of Lisa's seat, but when Lisa asks why Gary chose the name Lisa, Wyatt's hand is gone, only to reappear and disappear again depending on the angle of the shot.

Weird Science (1985)
21 continuity mistakes - chronological order
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)
Question: At the very end when Lisa is a gym instructor, when they pan from her feet up, on VHS and on my DVD the Rocky theme is played. But whenever I see it on cable, the Weird Science theme is played instead. Why is this?
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Chosen answer: They probably only had permission to use the song at the cinema and take home releases, so when shown on broadcast TV they'd have to use another song.