Corrected entry: When Jeannie comes downstairs to find the Principal in her house, she kicks his ass and then proceeds to call the police and tells them there is an intruder. Why didn't she recognise her own Principal? It did happen quickly when they jumped out at each other but they both paused before she kicked him. She certainly recognised him at the end of the film when they are at the back door.
Corrected entry: When the Ferrari is driven through the window, it is the only window on that wall without a 4-5" high frame along the floor. Various views of the wall show the surrounding windows having it; it was most likely removed to prevent the car from being obstructed in its fall.
Corrected entry: The name Shermer, which appears in Ferris Bueller's Day Off and The Breakfast Club, comes from Shermer Road, which is the road that runs in front of the high school where Ferris Bueller's Day Off was filmed. Another post mentioned School Drive, which runs along the side of the school.
Corrected entry: On the drive home with Jeanie, Mrs. Bueller is not wearing sunglasses when all of the papers get thrown around in the car. She is wearing them the rest of the time.
Corrected entry: In the scene where Cameron is venting his anger at the Ferrari with the jack holding up the rear drive wheels and Ferris and Sloan witness it. The camera pans down to the tachometer of the car. The tachometer shows the revolutions per minute at 0, but the engine's supposed to be running. You know it's the tachometer when a scene with the parking garage guys, they rev the engine and you can clearly see the tachometer on the left and speedometer on the right.
Corrected entry: The movie supposedly takes place in April, however based on Chicago's climate, it is quite clear that the actual filming was conducted well into the summer months based on how full and leafy all the trees are, not to mention the ivy on the outfield wall at Wrigley Field which does not become fully developed with leaves until late May at the earliest.
Corrected entry: At the beginning of the movie, Ferris' mother is examining her sick son and says to Mr. Bueller, "He doesn't have a fever, but his hands are cold and clammy and he says he's seeing spots." At the end of the movie, when Ferris narrowly beats his parents home and they enter his bedroom, Mrs. Bueller again touches her son's forehead and says, "You're still warm." I thought he didn't have a fever.
Corrected entry: The whole day's time sequence is terribly out of whack. For instance, when Rooney is wiping his face off after being spat on by the "Karate Champ" girl in the pizza joint, Ferris catches a fly ball. Harry Caray's play-by-play call can be heard in the background. He's calls the name "Lee Smith," indicating Lee Smith was on the mound for the Cubs. Lee Smith was a closer and likely would not be in the game until the 9th inning. Most day games at Wrigley start at 1:20 and last at least 2 hours. Therefore, the time would be about 3:30 PM when Ferris caught the fly ball. After that, he had time to make it back down to the Loop for a parade (presumably by elevated train), pick up the car, get back up to the North Shore (probably a decent 30 minute ride) take a dip in the pool, save Cameron's life, and race home to be in bed by the time his parent arrived home (6:00 sharp if you'll recall the father's lines at the beginning.) That's bad continuity. Aside from that, prior to the game, they dined at Chez Quis and went to the Museum (South Loop area).