Ferris Bueller’s day off was June 5, 1985 — exactly 30 years ago:
We know this thanks to a stunningly in-depth investigation by BaseballProspectus.com, which in 2011 managed to track down the exact game Ferris, Sloane and Cameron were watching at Chicago’s Wrigley Field (the Cubs vs the Braves, 5 June, 1985) by analysing who was on the field and how they fared in each inning.
The film made $70 million at the box office, with a budget of just $5 million. John Hughes wrote the script in six days.