The Breakfast Club

Emilio Estevez was originally going to play Bender, but Hughes couldn't find someone to play Andrew Clark so Emilio agreed to play Clark.

Molly Ringwald really wanted to play Allison but Ally Sheedy had already been promised the part.

The library in which this movie takes place was actually constructed in the gymnasium of Maine North High School specifically for the film. The school closed down in 1982, two years before filming began. The building had been used for park district purposes and the Chicago Blitz before the Illinois state police bought it, turning it into a police station, which it still is to this day.

The film's title comes from the nickname invented by students and staff for detention at New Trier High School, the school attended by the son of one of John Hughes' friends. Thus, those who were sent to detention were designated members of "The Breakfast Club". "The Breakfast Club" at that school probably took its name in turn from the title of American radio's longest running network entertainment show, broadcast from Chicago, 1933 to 1968.

Claire's entire ensemble was purchased specially for the character from a Ralph Lauren store, the only one in Chicago at the time. Hughes had rejected the original costume on the grounds that it wasn't sophisticated enough.

Nicolas Cage was originally considered for the role of John Bender but the production couldn't afford his salary at the time. John Cusack was originally cast as John Bender, but John Hughes decided to replace him with Judd Nelson before shooting began.

The original running time of The Breakfast Club (1985) was about two and a half hours. Thinking the film would not be a hit, Universal Pictures trimmed the running time down to the modern 97 minute version. The studio then destroyed the negatives of the deleted scenes. John Hughes said in a "Premiere" magazine article that he has the only complete copy.

The theme song, "Don't You (Forget About Me)", was written for the film by Keith Forsey. It was a number one hit for Simple Minds, and both Billy Idol and Bryan Ferry turned down offers to record it first (although in 2001, Billy Idol recorded Don't You (Forget About Me) as a bonus track for his Greatest Hits album). The song was also turned down by Chrissie Hynde of The Pretenders who then suggested they offer it to the band fronted by her husband at the time, Simple Minds.

Any hope of a sequel to "The Breakfast Club" was basically dashed due to the volatile relationship between John Hughes and Judd Nelson. John Hughes has stated that he would never work with Nelson again. Also, it is unclear whether or not Hughes still holds ill-will against his oft-cast starlet, Molly Ringwald. They had a falling out in the late eighties after Ringwald decided to move on from the teen film genre to pursue more adult roles, thus severing her relationship with Hughes.