Trivia: The licence plate on Jeanie's car says "TBC". This is an abbreviation for The Breakfast Club, another film that John Hughes wrote and produced.
Trivia: During the Beatles song, Kenny Ortaga (choreographer) came up with more knee dancing. But because Matthew Broderick had knee surgery before, that was cut.
Trivia: When Rooney is at the pizza parlor and he is walking up to the counter, the man that is standing to the right of Rooney (wearing glasses, and looking at the TV) is director John Hughes.
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.