Audio problem: In the scene at the Palace Hotel Ballroom, when the Blues Brothers are singing their 2nd tune (Sweet Home Chicago), you can hear both Jake and Elwood on the soundtrack but Elwood is dancing down the middle aisle without even a microphone in his hand and his mouth is not moving. There is also a shot during the same song where Jake's singing and pauses do not line up with what we see visually. When he sings "baby don'cha you want to go-oh - -" we see his mouth stop moving, then when he pauses, his mouth is still singing. As a matter of fact, the entire number has mistakes like this and mistakes of continuity. (01:54:20)
Audio problem: When Loretta is recording her first record, you hear the snare drum being hit on the drum head but the drummer is actually doing a rim shot.
Audio problem: When the guy from the Ryder truck comes over and rips one of the speakers from Bruno's father's cab, the sound being played doesn't change.