Blues singer and harmonica player Junior Wells made both his film debut and his final screen appearance as a member of the blues band in the strip club. He died just over three weeks before "Blues Brothers 2000" debuted in theaters.
During the scene where Elwood spins his car into the parking spot in front of Willie's, the space between the cars to the front and rear are smaller after Elwood leaves the car. Yet during the scene where the car is spinning into place, the gaps between the cars is much greater.
As the Bluesmobile is driving up out of the river (with the fanatics' boat on top), one can just barely make out an optical effect just under and ahead of the car, roughly aligned with the water pouring off. This was probably the result of a camera trick used to hide a tow cable.