* ActorAllusion: Ferris hacks into the school's system from his computer to change the number of absences he's had. [[Film/WarGames That's not the first time Broderick hacked into his school's system.]] Though Bueller is less enthusiastic about it:
-->''"I asked for a car, I got a computer. How's that for being born under a bad sign?"''
* AllThereInTheScript: Charlie Sheen's stoner character is named Garth Volbeck, though the film doesn't mention this.
** Also, a deleted backstory shows that Ferris and Garth were friends in the eighth grade. Garth's family's pretty messed up, and Ferris tried to help him and be his friend, but Garth eventually dropped out of high school and wound up in the police station next to Jeannie. That's why Ferris is so intent on giving Cameron a good time - [[TearJerker he blames himself for not helping Garth enough when he could.]]
* BeamMeUpScotty: Ben Stein as the economics professor never says, "Anyone? Anyone? Bueller? Bueller?" He does say these lines but separately. He first says, "Bueller? Bueller?" while taking attendance and then later during his lecture asks, "Anyone? Anyone?"
* CastIncest: On-screen siblings Matthew Broderick and Jennifer Grey dated and were even engaged for a while after appearing in this film together.
* DawsonCasting: Averted with Mia Sara, (Sloane) who was 18 (playing a high school junior). Played straight with Matthew Broderick (Ferris) who was 23, Jennifer Grey (Jeannie) who was 25, and Alan Ruck (Cameron) who was ''29'' when the film was shot during the fall of 1985.
* DyeingForYourArt: Charlie Sheen stayed awake for 48 hours before filming his scene so that he would appear tired and strung-out. Now he prefers the quicker method of good, all-natural cocaine.
* EnforcedMethodActing: In the cab, when Ferris tickles Sloan. Actress Mia Sara's laughter was real, because MatthewBroderick and Alan Ruck actually took off her shoe and tickled her foot.
* FlipFlopOfGod: The DVD commentary pegs Ferris as a spoiled jerk. However, Hughes intentionally cut a scene that ''explicitly'' makes Ferris a thief, and cast Matthew Broderick in the role because he felt Broderick was the only one who could make Ferris likable. So do we empathize with Ferris or not? Either interpretation of the character is equally valid. And it doesn't help that both interpretations ''can'' work concurrently with each other (i.e. Ferris is a jerk and trickster, but he's OUR jerk and trickster).
* HeyItsThatGuy: Ben Stein plays the dull, drab teacher whose class Ferris escapes from at the beginning of the film. He would later rehash this role on ''TheWonderYears'', among many other places.
** Also ActorAllusion for Ben Stein, as he was a political commentator and speech writer, who wrote and spoke at length about economics, just as he taught in this film. In fact, he wasn't even given lines for his lecture scenes; he was just told to deliver a lecture on something he knew a lot about.
** Aside from his work in Broadway theater (for example, his award-winning performance in the revival of ''HowToSucceedInBusinessWithoutReallyTrying'' and the musical adaptation of ''Film/TheProducers'') this is pretty much the movie that everyone will associate Matthew Broderick with. Except maybe [[Film/WarGames this one]] or [[Film/{{Godzilla 1998}} that one]].
** And then there's Alan Ruck. (''Series/SpinCity'' fans, take note.) He's also remembered as the [[Film/StarTrekGenerations guy who basically got Captain Kirk killed.]]
** The flower delivery guy was played by Louie Anderson.
** Creator/JenniferAniston played Ferris' sister in the short-lived TV show. [[Series/DiagnosisMurder Charlie Schlatter]] was Ferris.
** Simone Adamley was played by a young [[Film/BuffyTheVampireSlayer Kristy Swanson]].
** Grace the secretary was played by [[Series/TheHoganFamily Edie [=McClurg=]]].
** And, last but not least, Creator/CharlieSheen as the [[FunnyAneurysmMoment drugged out kid]] in the police station.
* HeyItsThatVoice: Ferris is adult Simba in ''Disney/TheLionKing''.
* IAmNotSpock: For a long time, MatthewBroderick never liked talking about this movie, though it seems he's eased up about it, [[AdamWesting since he appeared in a 2012 Super Bowl commercial that parodied the film]].
* RealLifeRelative: The actors who played Ferris's parents (Cindy Pickett and Lyman Ward) later got married in real life. Unfortunately, however, they divorced in 1992.
* StarMakingRole: Three years before ''Ferris Bueller,'' ''Film/WarGames'' is what got Broderick noticed. But this movie clearly is what made Broderick a star, and it is arguably his most famous role.
* ThrowItIn: "They think he's a righteous dude" was improvised by Edie [=McClurg=], the actress who played Grace.
** Ben Stein improvised the entire lecture about the Hawley-Smoot Tariff.
* WhatCouldHaveBeen: John Hughes' first choice to play Ferris was Michael J. Fox, which is ironic because Broderick was Gary David Goldberg's first choice to play Fox's role of Alex P. Keaton in ''FamilyTies''. However, Broderick declined, partially because his father, James Broderick, had become terminally ill, and partially because he did not actually want to commit to a weekly TV series. Even more ironically, James Broderick had co-starred with Fox's ''Family Ties'' co-star, Meredith Baxter-Birney, on the ABC drama, ''Family''.
** Creator/JohnnyDepp was also considered, as well as Creator/RobertDowneyJr, Creator/JimCarrey, Rob Lowe, Creator/TomCruise and JohnCusack.
* WordOfDante: A researcher discovered the titular day off was [[http://sports.yahoo.com/mlb/blog/big_league_stew/post/Bueller-For-which-Cubs-game-did-Ferris-play-hoo?urn=mlb-318065 June 5, 1985]], based on the Cubs game that Ferris goes to in the movie.
** The game where scenes from the film were shot was actually played on Sept. 24, 1985.
** The late school-year date adds some [[TheLastHurrah subtext]] to the proceedings; Ferris was mere weeks, if not ''days'' away from graduating.
* WriteWhoYouKnow: Cameron and Charlie Sheen's character were both based on people John Hughes knew in high school.
* This is former U.S. Vice President UsefulNotes/DanQuayle's favorite movie.
* Three replica [[CoolCar 1961 Ferrari 250 GT Spyder California]] replicas were used in filming.
** The Hero car was built by Mark Goyette and leased to Paramount for filming. This one was used in almost all exterior shots, and is the one that jumps over the camera. When filming was completed, it was returned to Mark, with the exhaust crushed and the rear body panels cracked. He repaired it and sold it to a young couple in California. The husband ran it off the road, and Mark rebuilt the front end. The couple later sold it in the '90s, and it resurfaced in the early 2000s, but hasn't emerged again since.
** A kit was sold to Paramount for their stunt car, but they did such a poor job assembling it that it was unusable for anything but falling out the window of Cameron's house at the end. It was later rebuilt and ended up in Planet Hollywood Minneapolis, but fell off the map along with Planet Hollywood Minneapolis.
** A third kit, meant to be a shell to be dropped out of the window, was bought but never completed. Mark Goyette mentions he heard it was completed and sold off, but it could just as likely be sitting in a backlot at Paramount.
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