Continuity mistake: In the deleted scene where Elwood goes into the manager's office to quit, right before he walks in the door he sets his briefcase down, it is slightly crooked and in the center of the floor. When he goes to leave it is sitting straight and further to the left.
Continuity mistake: At the end of the church scene, James Brown is shown placing the microphone back on its stand. Then it cuts to a wide shot of James pacing the stage, mic in hand.
Visible crew/equipment: In the gospel church scene, where James Brown is whipping up the congregation, at one point as Elwood is dancing at the front of the church after Jake has "seen the light", where the camera is pointing down the nave of the church from what would be the altar end, a technician can be seen scurrying, at the back of the church, from the left to the right aisle.
Continuity mistake: In the scene where they go to Elwood's apartment, Elwood puts on a 78 RPM Decca Louis Jordan record. The record is entitled "Saturday Night Fish Fry". But the song that plays is "Let The Good Times Roll".
Revealing mistake: When Jake, Elwood and the cops are buried in rubble from the hotel, you see one of the cops dragging himself out of the debris has two bricks sitting in the brim of his hat. That's either a very strong hat or very light bricks...
Continuity mistake: In the mall chase scene, when the police car flips over, you can see the antenna break off the side of the car. When they cut back to the car again, you can see it break off once more. Then, when they show that the car has stopped spinning, the antenna is completely intact.
Continuity mistake: When the three ladies of the Soul Food Chorus get up to sing "Think" with Aretha Frankin, their food is sitting on the counter; ten seconds later in a wide shot, it has gone. (This is undoubtedly so that "Blue" Lou can do his thing on the counter.) When the ladies sit down again and get a nasty look from Aretha after Matt and Lou have left, their food is back again.
Continuity mistake: When we see the Nazi's falling in their car one shot shows the car from above falling into an area without any buildings around the docks. When the car lands however it is in a built-up area of the city. [Due to the lack of available special effects, the crew had to actually drop a car from a helicopter onto the area shown without any buildings because of safety issues. The landing of the car in the city area was edited into the scene, the rest of it was real.]
Continuity mistake: In the beginning of the movie, when Jake and Elwood jump the drawbridge you see the gate arms are down. When the car lands on the other side the gates are up.
Continuity mistake: When Carrie Fisher confronts Jake in the underground tunnel, Jake can be seen wearing a pair of black wellies instead of his usual shoes.
Continuity mistake: In the scene where the Blues Brothers visit the Penguin, the door Elwood opens while running away closes between shots and he is seen opening it twice.
Continuity mistake: At the end of the movie, just before crashing through the Daley Building, the driver's side rear window is rolled down, then it is up again just before (and as) the car falls apart.
Revealing mistake: When Jake sees the light and shouts, "The band!", he flips through the church and back to Elwood. When he stops, he is almost as tall as Elwood. This is because the stunt double is not nearly as short as John Belushi.
Continuity mistake: In the shopping mall car chase scene, the police cars that tips over has got siren lights at the top but when they tip over and slide along the floor and spin, on the inside view of the car, you can see the lights have been taken away for the car to slide better. On the outside view of the car sliding you can see the lights on the top of the car.
Continuity mistake: The first bridge in the movie is rising very fast. When they drive on the bridge, it stands lower than before, and the jump they make, is over a small area, although you see later that the bridge is completely up.
Continuity mistake: When Carrie Fisher first attacks the boys with rocket-propelled grenades at the hotel doorway, they dive for the sidewalk and are covered with debris. As they rise moments later and enter the hotel, their black suits and hats are covered in white cement dust. In the immediate next shot, as they climb the hotel staircase, their hats and suits have no dust whatsoever.
Revealing mistake: When Jake and Elwood are driving through the mall, they leave by driving through some store, if you watch as the people run to get out of the way, a black man with an apron on runs right into the camera.
Continuity mistake: During the mall chase, a semi-profile shot shows the squad car roll onto its roof and slide with a large panel of orange signage pinned under the roof. Camera cuts to a view of the officers inside the squad car, and there is no signage nor any other debris pinned under the car's roof. Camera cuts back, and the signage is again pinned under roof. Camera cuts back to frontal view, and the signage is gone again.
Continuity mistake: The woman in the car trying to shoot Jake has a couple of errors. First, she gets six shots out of a four barrel weapon without reloading. Second, she goes from having the weapon out of the window, to no weapon and driving in one second, where it took at least five or six seconds to get it out and aim it.
Factual error: The street Cortland doesn't go "northbound," as the black cop said he was traveling on. It's an E-W street.
Revealing mistake: During the big chase scene at the end, right before the Nazis accidentally drive off the bridge, the Bluesmobile is seen doing a backflip over their car. Watch carefully as the Bluesmobile first lifts off the ground- an air-ram is visible firing under the car, which causes the car to begin the flip. (Note: This scene has been cropped in some releases so that the air-ram isn't visible, but it is still present in other releases of the film).