<P> On the set, Belushi's drug use worsened . Fisher, who herself later struggled with cocaine addiction, says Landis told her to keep Belushi away from the drug . Wendell was hired to clear any from the places Belushi visited off - camera . Nevertheless, at one point, Landis found Belushi with what he described as a "mountain" of cocaine on a table in his trailer, which led to a tearful confrontation in which Belushi admitted his addiction and feared it could eventually kill him . </P> <P> After Belushi's wife Judy and Aykroyd had a talk with Belushi about his antics, the production returned to Los Angeles . Filming there again ran smoothly, until it came time to shoot the final sequence at the Hollywood Palladium . Just beforehand, Belushi fell off a borrowed skateboard and seriously injured his knee, making it unlikely he could go through with the scene, which required him to sing, dance, and do cartwheels . Wasserman persuaded the city's top orthopedic surgeon to postpone his weekend plans long enough to stop by and sufficiently anesthetize Belushi's knee, and the scene was filmed as intended . </P> <P> Much of the film was shot on location in and around Chicago between July and October 1979, including Wauconda, Illinois, where the car crashes into the side of Route 12 . Made with the cooperation of Mayor Jane M. Byrne, it is credited for putting Chicago on the map as a venue for filmmaking . Nearly 200 movies have been filmed in Chicago . "Chicago is one of the stars of the movie . We wrote it as a tribute," Dan Aykroyd told the Chicago Sun - Times in an article written to mark the film's 25th - anniversary DVD release . </P> <P> The first traffic stop was in Park Ridge, Illinois . The shopping mall car chase was filmed in the real, albeit shuttered, Dixie Square Mall, in Harvey, Illinois . The bridge jump was filmed on an actual drawbridge, the 95th Street bridge over the Calumet River, on the southeast side of Chicago . The main entrance to Wrigley Field (and its sign reading "Save lives . Drive safely, prevent fires .") makes a brief appearance when the "Illinois Nazis" visit it after Elwood falsely registers the ballpark's location, 1060 West Addison, as his home address on his driver's license . (Elwood's Illinois driver's license number is an almost - valid encoded number, with Dan Aykroyd's own birth date embedded .) Jake's final confrontation with his girlfriend was filmed in a replica of a section of the abandoned Chicago freight tunnel system . The other chase scenes included lower Wacker Drive, Lake Street, and Richard J. Daley Center . </P>

Where was the opening scene of blues brothers filmed