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 Edits proposed to plot description 

""“Joliet” Jake Blues is released from the Joliet Correctional Center after serving three years of a prison sentence after being convicted of armed robbery.""

Entry for Joliet Correctional Center.

""Jake is irritated at being picked up by his brother Elwood in a battered former Mt. Prospect, Illinois police car, instead of the Cadillac The Blues Brothers used to own.""

It's unclear here, however the Caddy Jake refers to may be Murph and the Magictones' pink vehicle first seen in the ""Howard Johnson's"" scene where Jake and Elwood phone Maury Sline and are blasted the flame-throwing mystery woman. 

The Blues Brothers visit their childhood home, a Roman Catholic orphanage, Saint Helen-of-the-Blessed-Shroud Orphanage. From Sister Mary Stigmata (Kathleen Freeman), The Blues Brothers learn that a property tax lien on the orphanage property will be foreclosed upon unless five thousand dollars in property taxes is remitted on its behalf to the county (the associated church has elected instead to sell the building to the Board of Education rather than pay the tax assessment).

Part of the film's humour is the actual name of the orphanage. Credit to Kathleen Freeman. People erroneously thing charities and churches are completely tax-exempt; however the exemption most notably only extends to Federal income taxes. The property tax bill would probably have remained an unforeclosed lien had the church not decided to sell voluntarily to the Board of Education.

""At the advice of their childhood mentor, Curtis (Cab Calloway), The Blues Brothers attend an evangelical church service at Triple Rock Baptist Church, led by the Reverend Cleophus James (James Brown), where Jake has an epiphany: The Blues Brothers can legitimately raise the funds by re-forming their rhythm and blues band, The Blues Brothers’ Show Band and Revue.""

Credit to Cab Calloway and James Brown.
  
""As The Blues Brothers drive past a doughnut shop and Nelson Funeral Home in the Bluesmobile, Elwood’s driving alerts two Illinois State Police troopers, Trooper Daniel (Armand Cerami) and Trooper Mount (Steven Williams), who, after pursuing The Blues Brothers into a quiet, secluded residential area, learn from their in-car SCMODS (State-County-Municipal Offender Data System) computer terminal of Elwood’s suspended driver's license. When Trooper Daniel and Trooper Mount attempt to place Elwood under arrest, Elwood speeds off, escaping by driving and crashing through, with the Illinois State Troopers in pursuit, the Dixie Square Mall.""

Entry for Bluesmobile; since location in Chicago and Illinois is obviously a major plot element, reference that the particular law-enforcement agency here is the ISP; SCMODS article already exists, with explanation of the meaning, in this context; article exists for Dixie Square Mall. 

""After parking the Bluesmobile in an alley-end compartment next to a high-voltage transformer (hence the Bluesmobile’s remarkable magical abilities) and arriving at Elwood’s home, a hotel for transients, The Blues Brothers are mysteriously unharmed from a bazooka attack launched by a mystery woman (Carrie Fisher).""

Credit cast member Carrie Fisher; this scene is cut from many televised versions, DVD featurette commentary explains that Canadian actor Aykroyd felt this scene explained the Bluesmobile's magical abilities, yet director Landis felt this was not transparent.

""The next morning, just as the Illinois State Troopers who attempted to arrest Elwood the previous evening, with the help of Parole officer Burton Mercer (John Candy) as to the true address of “the elegant abode of one Elwood Blues” (because Elwood had ‘falsified his renewal’ and ‘put down ten sixty West Addison’, the street address of Wrigley Field) attempt to serve an arrest warrant at Elwood’s tiny room. The mystery woman detonates a bomb that demolishes the building, which inadvertently saves The Blue Brothers from another attempted arrest.""

Candy's character was important because he assisted in locating Elwood's abode; the 'Wrigley Field bit' is important plot-element humor.

""Elwood proceeds to his “straight job”, on the assembly line at an aerosol-can manufacturer, takes several cans from the line and places them in his briefcase, and visits the plant manager, quitting his job, citing a decision to become a priest (curiously, Elwood’s supervisor’s office is adorned with a U.S. flag and an Illinois state flag, suggesting that the aerosol-can manufacturer in an enterprise owned by the government of the State of Illinois—or else simply that Elwood’s supervisor thought it would be cool to adorn his office with