Trivia: Charlie Sheen stayed awake for 2 days to play the guy in the police station, so he could get the right look for the scene.
Trivia: When Jeanie is in the police station, we see a badge that says Police Officer Shermer. Shermer is the town in which "The Breakfast Club", another John Hughes movie, is set.
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.
Trivia: The prop crew used four replica fiberglass Ferraris for the film. (01:24:30)
Trivia: Hidden burlap sheets covered the ground where the Ferrari crashed so the ravine would be protected from the broken glass. The crew had little idea of how things would go when the car crashed to the ground; fortunately a fence prevented the vehicle rolling into a neighbor's yard.
Trivia: Matthew Broderick had to tickle Mia Sara's knees and feet to get her to laugh in a natural way in the taxi.
Trivia: The exterior scenes were filmed at Glenbrook North High School in Northbrook, Illinois. John Hughes graduated from that school in the late 1960's. The interior scenes were filmed at Maine North High School in Des Plaines, Il.
Trivia: Anthony Michael Hall turned down roles in Ferris Bueller's Day Off (Cameron), and Pretty In Pink (Duckie) so he wouldn't be typecast.
Trivia: At the beginning of the scene, in which Rooney calls Ferris's mother to inform her about her son's absence, you can see a poster on a wall in the school that reads "Go Shermer". The Breakfast Club, another John Hughes film, met on a Saturday at "Shermer high school".
Trivia: Ferris' mom's licence plate reads "VCTN" which stands for "National Lampoon's Vacation." A film for which John Hughes also did the screenwriting.
Trivia: All of the glass walls inside the home used in the Ferrari scene were created by the crew. After shooting the film, the crew put the original glass back inside the house walls. (01:24:50)
Trivia: Ferris Bueller's home address is "2800." That address was also director John Hughes' home address when he was a kid. (00:51:20)
Trivia: The obese guy that is wearing the fishing gear, & dancing during the parade scene, is the film's prop master. (01:03:45)
Trivia: A drawing of director John Hughes appears on the Bueller's refrigerator, created by his then six year old son.
Trivia: Rooney's license plate is 4FBDO. Stands for "For Ferris Bueller's Day Off."
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.