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)
Trivia: The town in which Gary and Wyatt live is called Shermer. Another John Hughes reference to The Breakfast Club and Ferris Bueller's Day Off. (00:11:35 - 00:16:50)
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Answer: I can't remember Chet's line, but Lisa says "Chip" so slowly and deliberately, it must have been scripted. When I heard it, I chuckled because I thought she was showing him how little he mattered to her by misstating his name.