20 Things You Didn't Know About The Blues Brothers
17. Aykroyd Littered The Script With References To His Own Life
When Dan Aykroyd wrote the script, he decided to intertwine facts about his own life in with the fictional world of the Blues Brothers.
The licence plate of the Bluesmobile is BDR 529, referencing the Black Diamond Riders, a Canadian motorcycle club that Aykroyd is a long-time member of. Along the same lines, Elwood's driver's licence seen on the police information screen contains Aykroyd's actual date of birth, July 1, 1952.
Much like Elwood, Aykroyd grew up in a strong Roman Catholic tradition and loved blues music since he was a teenager. He grew up in Ottawa, Canada, a town not known for blues music by any means, but Aykroyd haunted the few blues bars that catered to the several universities there constantly.
Aykroyd is a military and law enforcement enthusiast. He insisted that the giant speaker on the Bluesmobile had to be a Canadian-made Cold War air-raid siren exactly like the one at his elementary school. He filled the movie with accurate law enforcement terms that he knew from growing up in a police family. Aykroyd's grandfather was a Mountie, and he himself is a reserve deputy in both Louisiana and Mississippi.
Write what you know, as the old saying goes.