Visible crew/equipment: Near the beginning of the movie there is a brief scene around the empty house. While the camera is in the kitchen you can see a reflection of one of the set guys moving in the fridge handle.

Ferris Bueller's Day Off (1986)
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Directed by: John Hughes
Starring: Alan Ruck, Jeffrey Jones, Jennifer Grey, Matthew Broderick, Mia Sara
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Ferris: Cameron has never been in love - at least, nobody's ever been in love with him. If things don't change for him, he's gonna marry the first girl he lays, and she's gonna treat him like shit, because she will have given him what he has built up in his mind as the end-all, be-all of human existence. She won't respect him, 'cause you can't respect somebody who kisses your ass. It just doesn't work.
Trivia: Throughout the movie, many different characters either sing or hum the song "Danke Schoen". Ferris sings it in the shower, Mr. Rooney hums it while he is waiting at Bueller's front door, Jeanie sings it while running down the stairs after kissing Charlie Sheen, and Ferris sings it again during the parade.
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Answer: Sloane knew it was a hoax. Ferris would not have done something like that without her knowing. Rooney pretty much had figured it out, but could never prove anything. Once he was discovered inside the Bueller house (illegally) by Ferris' sister, anything he did know he would have to keep to himself.
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Sloane starts to put her jacket on the moment that she sees the school nurse walk into the classroom, suggesting that Sloane already knew she would be called out, and she smiles to her classmates.