During the mall chase scene, toward the end of the scene, the blues mobile (and one police car) drive into the Jewel food store. The very next scene shows them driving out of the window of the JC Penney store.
(Note, the reason for this is that the JC Penney in the mall where the scene was filmed was "dressed up" as a Jewel food store for the filming inside the mall—though the mall where it was filmed, Dixie Square Mall in Harvey, Illinois, actually had a Jewel food store—but they didn't "dress up" the outside JC Penney sign which was clearly visible when the bluesmobile drove out of the window to exit the mall.)
In an early scene, when Jake and Elwood are talking while driving at night (just before the red light incident) they will pass the same house and parked car 3 times as the dialog moves forward.
Contributed by: Jon Deibel
At the end of the car chase in the mall, the black man trying to get out of the way of the crashing police car runs directly into the camera. You can see his hands hit the lens.
When Jake and Elwood are performing in the ballroom check out their hands; they are both wearing big diamond rings. When they are in the tunnel the rings are gone.
Contributed by: Bob Green
In the Chicago Police Car crash on lower Wacker drive, the cables pulling the cars are clearly seen!
During the final chase scene when the troopers crash, they call in to say that they are on Rt. 47 heading into chicago; Rt. 47 never goes to chicago. It heads back towards the state prison area.
When you see an exterior shot of the hotel that the Blues Brothers perform in at the end of the movie there is clearly an ohio state flag there. It's in the left side of the shot.
After Carrie Fisher shoots the shoulder fired rockets into the hotel, Jake and Elwood stand up all covered in dirt and brick dust, but when they walk into the lobby of the hotel, they are all clean.
Same when she blows up the hotel and they crawl out from under the bricks. Next scene they are in new suits.
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