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)
Plot summary
Directed by: John Hughes
Starring: Matthew Broderick, Jeffrey Jones, Mia Sara, Alan Ruck, Jennifer Grey
Ferris Bueller fakes sick to his parents to get a day off school. His best friend, who is home 'sick', helps Ferris get his girlfriend out of school and they have a day in the city.
Ferris: Pardon my French, but Cameron is so tight that if you stuck a lump of coal up his ass, in two weeks you'd have a diamond.
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.
raywest ★
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.