Corrected entry: When Ferris calls Cameron, he is lying in bed. The phone rings and he says "I'm dying." Then he answers the phone and Ferris says "you're not dying, you just can't think of anything to do." Cameron had not answered the phone yet, so there is no way that Ferris could have heard him say that he was dying.
Corrected entry: At the end of the movie when Ferris' parents come home you see their foyer by the front door loaded with get well flowers and balloons, etc. Who accepted the deliveries if no one was home all day? Rooney wasn't around long enough to have brough ALL those flowers and gifts inside. Also, as much as he despises Ferris, I'm sure he would rather see them on the front porch to wilt. The only reason he signed for the first one was because he just happened to be standing on the front porch when the deliveryman arrived.
Corrected entry: When Ed Rooney presses the phone button to take Ferris' call he says nothing but Ferris speaks right up to ask him to get his sister to get his homework assignments. How did Ferris know Rooney was on the phone?
Correction: Ferris would have been put on hold, so was most likely having to listen to music. When Rooney pressed the appropriate phone button, Ferris would be taken off hold - the music would have stopped, so Ferris would know that somebody was now listening - as he'd presumably asked to speak to Rooney, he simply assumed, correctly, that that was who he was speaking to.
Corrected entry: Jeanie doesn't undo her seatbelt before she jumps out of the station wagon. And additionally in one shot of the car parked - the seatbelt is slammed in the door of the car and hanging out but when they cut back to the car seconds later, the seatbelt is gone.
Correction: While we see her wearing the seatbelt on the way home, she is pulled over by cops. After that we don't see a shot of her until she jumps out of the car. Plenty of time passes for her to undo her seatbelt before pulling into the driveway (and we don't even know if she was wearing it after being let go by the cops).
Corrected entry: When Jeanie is racing to beat Ferris home, a cop chases Jeanie and eventually Jeanie pulls over. Later, Mom says that Jeanie got a speeding ticket. It is unlikely that Jeanie would have gotten home before Ferris or Dad after pulling over and getting a speeding ticket(s), yet somehow Jeanie gets home first.
Correction: This is easily explainable: Ferris was on foot cutting through yards, someone's house, and bounding over a fence. Ferris' dad, however, was stuck behind the slow, swerving old lady, and Jeanie could have been very close to the house when she was stopped since it's unclear how long she was speeding before that.
Corrected entry: When there is a commotion in Rooney's office and Grace is on the phone a green binder appears on Rooney's desk. It was not there before.
Correction: Grace puts there during the commotion.
Corrected entry: When Ferris rings Rooney to asks if his sister can bring any work assignments home, he's speaking with a healthy, cheerful voice. Seems weird that someone as smart as Ferris completely forgets that he is meant to be sick that day, especially when he is speaking to the Dean.
Corrected entry: At the beginning of the movie when Ferris and Cameron are taking his dad's Ferrari out to pick up Sloan there is a very old green classic car in the background of the garage. Later in the movie when they return it is missing. It isn't very likely that sometime during the day Mr. Fry returned home from work to take it out for a drive without noticing the Ferrari which he never drives is missing.
Correction: The other classic car is still in the garage when they return. You can briefly see the shadow of its windshield. They just don't pan in on it during the scenes when they have returned to the garage.
Corrected entry: In the scene where Ferris jumps into the pool to save Cameron, you see the white chair before he jumps into the water. The chair gets knocked into the water and you can see it floating from beneath the water's surface. When Ferris drags Cameron out, you can see that the chair is gone, not floating or on land.
Correction: Cameron jumps in at the deep end of the pool. When Ferris drags him out, they are at the shallow end of the pool (the opposite side) because he pulls him to the steps. Even when they start splashing with Sloan, they remain at the shallow end through the rest of that scene. The camera just doesn't pan out enough to show the chair or anything else at the other end of the pool.
Corrected entry: When they are all driving in downtown Chicago, Ferris is not staying within the lines of the street at all, he's about 1/3 into the next lane to the left, yet none of the other cars seem to mind.
Correction: Cars don't have feelings, so of course they don't mind. If you mean the drivers, the scene is not that long, and we cannot make out their faces enough to see if they are agitated at Ferris' bad driving or not.
Corrected entry: Towards the end of the movie, the Ferrari is lifted up on a jack and is running in reverse to "take off the miles." In the next scene you see the wheel, but it is spinning so that the car would be going forward, not in reverse.
Correction: Just as the wheels of a speeding car in a car commercial appear to be spinning backwards, so do the wheels of a reversing car appear to be running forward. This is an anomoly caused by the relative speed of the wheels vs. that of the film and, to date, no one has found a way to alleviate it. The filmmakers here would have been better off letting the wheels spin forward - then they would have looked like they were going backward.
Corrected entry: When Ferris' mom tells Ferris that she's going to show a house to that family from Vermont she says the word "that" twice.
Correction: Not an audio problem, just a case of stuttering on her part while trying to formulate her thought. It happens to most people at one time or another.
Corrected entry: In the scene where they take off after picking up Sloan in the parking lot, Ferris revs the engine (quite noticeable) and suddenly is on the street outside the lot. That must have been one sharp turn.
Correction: I've watched for this twice, and after Ferris revs the engine, the first shot of him driving off shows him still in the parking lot. There's no mistake here.
Corrected entry: The film takes place in April in Chicago. This is not the ideal swimming time of the year with average daytime highs in the low to mid 50's with high winds.
Correction: At the beginning of the movie, the radio weatherman comments about what a beautiful day it is, with highs expected in the mid-to-high 70's. The temperature is already 75 although it is probably around 7 in the morning.
Corrected entry: If Cameron's dad is suspicious enough of Cameron to note the mileage when he leaves, why doesn't he just take the keys when he leaves, or just hide them?
Corrected entry: When Cameron is on the phone with Mr. Rooney pretending to be George Peterson, Ferris calls the school. Grace picks up the phone in the outer office and tells Ferris to hold. You clearly see the third button (line three) is the one he called on. Grace says that Ferris is on line two. When Mr. Rooney puts Cameron on hold and listens to Ferris, after Ferris hangs up, the camera cuts to the phone buttons on Mr. Rooney's phone showing that Ferris was just on the second button (line two).
Correction: While not likely, there is no requirement that the phones have the same lines or be in the same order, so the line assigned to the third button on Grace's phone could be the second line on Rooney's phone.
Corrected entry: Near the end, there's a huge parade in downtown Chicago being held in the middle of a school/work week with no explanation about why it is in progress when parades are typically held on the weekend. Despite that, hundreds of people, who would normally be working, are there watching it with their kids who, like Ferris and his fellow truant pals, should be in school.
Correction: First off, it's made very clear it's the Steuben Parade (a very popular German-American parade held in Chicago in September). While there is no "explanation" in the movie, parades are held in the middle of the week for various reasons, such as bad weather on the scheduled day, etc.
The Steuben Day Parade is held on a weekend day in September, not in the Spring. In most cities, it is the third Saturday of September. It is inconceivable that if a parade of that size and duration was unexpectedly cancelled for any reason that it would just be moved over to the middle of the week. The logistics are such that it would either be cancelled or rescheduled for another weekend which would take months to arrange due to the tremendous time, planning, and physical work involved to set up the staging areas, issue new permits, transport the floats, reschedule marching bands, drill teams, and other participants, close streets, reroute traffic, handle crowd control, have security, do promotion, etc.
This correction was done in my infancy of joining the website. I was trying to correct the mistake of what the parade was for (but did acknowledge it's a September parade) rather than accept the Steuben parade was out of place and wouldn't have been scheduled for the following year if the film was meant to be set 1-2 months before graduation.
Corrected entry: Jeannie kicks the principal in the face three times and doesn't recognize him. It's clear from an earlier scene that she is a regular complainer at his office.
Correction: She's hardly expecting to see her school principal, who by now is a disheveled mess, to be in her house, crawling on the floor. She's terrified, thinking Rooney's a burglar, and after kicking him, she runs off in a panic without ever looking directly at his face.
Corrected entry: When Ferris and his friends are at the fancy restaurant where his father is eating. They notice him waiting for a cab and freak out and sneak into the cab right before Ferris' father. Why not just wait inside for a minute until he leaves?
Correction: Ferris is confident and daring to the point of absurdity. Several hours later he appears on a parade float, in the view of thousands. To him, sneaking into a cab under his father's nose is a perfectly normal thing to do.
Corrected entry: At the beginning of the movie when Ed Rooney is talking to Ms. Bueller he says 'if he thinks he can just coast through this month...' then Ferris says later something about 'a couple of months until we graduate'
Correction: Some, if not most, American high schools tally student grades and absences through the month of, say, April in order to have time to calculate the information they need for graduation near the first of June. If it is near the beginning of April (they don't specifically say), Ferris can try to 'coast through this month' because he knows anything that happens in May won't count, hence 'a couple of months until we graduate' - April, May, and possibly a week or two in June.
Correction: This is done intentionally to show Ferris knows Cameron so well he knows what he's thinking.