In the open scenes of the Blues Brothers (1980), we see Jake Blues paroled from jail for good behavior. Is it ever explained, in this movie, or the sequel, or in any other media, why he had been incarcerated in the first place?
Reading through a transcript of the movie we see:
The reason he got locked in the slammer in the first place...
was for sticking up a gas station to cover you guys.
He pulled that job to pay for the band's room-service tab...
from that Kiwanis gig in Coal City.
So I don't want to hear any more of this small-change sh*t.
(I cleaned it up some)
Presumably a robbery.
In the script, there is this line:
SISTER MARY: So now, what do you two have planned... another cheap robbery...?
But I don't think it is in the movie.