You're looking at one place Matthew Broderick and Mia Sara have a ball playing hooky in this film
... case on why Matthew 
Broderick, Mia Sara and Alan Ruck likely shot their Wrigley scenes... [DOC] [TLE] Ferris Bueller's Day Off: Amazon.ca: Matthew Broderick, Alan Ruck ... [PAR] Sure, Matthew Broderick is still appealing as the perennial truant, Ferris, who ... 
Cameron Frye (Alan Ruck), and Sloane Peterson (Mia Sara) take the day off.