Ned Zeman with a great piece in Vanity Fair about the making of The Blues Brothers:
One night at three, while filming on a deserted lot in Harvey, Illinois, Belushi disappears. He does this sometimes. On a hunch, Aykroyd follows a grassy path until he spies a house with a light on.
“Uh, we’re shooting a film over here,” Aykroyd tells the homeowner. “We’re looking for one of our actors.”
“Oh, you mean Belushi?” the man replies. “He came in here an hour ago and raided my fridge. He’s asleep on my couch.”
Only Belushi could pull this off. “America’s Guest,” Aykroyd calls him.
“John,” Aykroyd says, awakening Belushi, “we have to go back to work.”
Belushi nods and rises. They walk back to the set as if nothing happened.
An amazing story, no question. The entire thing is very interesting, and while it’s intriguing as all get out for someone who cherishes The Blues Brothers as one of the best comedies of all-time, it’s even more intriguing to think about Belushi. His issues with drugs ultimately led to his demise, but there were clearly those who believed he couldn’t function without it, including Belushi himself. Belushi’s death left many to wonder what could have been. He was so charismatic and funny, and in the few movies he actually made, his performance was spectacular.
Meanwhile, this piece on what Aykroyd and others went through to make The Blues Brothers is somewhat amazing, especially considering the names involved. Nowadays, it seems like the standards for what movies get made is much lower.