Factual error: When Anthony Michael Hall is being pursued by the police, they have the logo of City of Los Angeles, but this takes place in Chicago. (01:18:40)

Weird Science (1985)
1 factual error - 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 film is partially based on the 1950's EC comic series, "Weird Science", Vol. 1 #5 "Made From the Future." Joel Silver acquired the filming rights for the comic magazine.
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Answer: According to the Wikipedia page for this movie, Lisa transforms Chet into a giant, talking turd.
Casual Person