These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
For Blues Brothers 2000, anything by The Louisiana Gator Boys is hard to beat. They have Eric Clapton! And B.B. King. And Bo Diddley. And Dr. John. Billy Preston! Charlie Musselwhite. Koko Taylor. And numerous others.
Also in Blues Brothers 2000, when the band is cornered at the state fair and perform a haunting rendition of "Ghost Riders In The Sky".
It's so awesome it summons undead cowboys on giant Hellish Horses chasing skeletal cattle across the sky! it's quite possibly the most awesome scene ever put on film!
The brothers' booking agent Sline explains that rhythm and blues is past its prime and Discois in vogue.
Cab Calloway's "Minnie the Moocher" was nearly a victim to this trope. When Calloway went in to record, he was under the impression that it was his recent disco version that Landis wanted, and was highly annoyed to find out they wanted him to sing it as he originally did. He presumably changed his mind when his performance of that song in the film made him a star again.
Ear Worm: A new one every 10 minutes, but what do you expect when Aretha Franklin, Ray Charles, James Brown, and Cab Calloway are cast members?
Hilarious in Hindsight: A Russian gangster promises one of his comrades that they will, eventually, drink vodka from Elwood's skull. Made funnier by the fact that Mr. Aykroyd now has a vodka brand which comes... in a bottle... shaped like a skull. There are even skull-shaped shot glasses available!
Also, Elwood's "Who you gonna call, Jake?" at the phone booth is put in entirely new perspective when you consider Aykroyd's other well known work.
Recently, another movie has featured an extended, extremely destructive chase scene through the Chicago underpass system. Soundtrack swap material, anyone?
"Are you the police?" "No, ma'am, we're musicians." Guess which band was just beginning to become internationally famous at the time when the movie was released?
Refuge in Audacity: The climax of the film is hilarious simply because of how ludicrously over the top it all is. Some of the car stunts especially fall into this.
Replacement Scrappy: Subverted and played straight in Blues Brothers 2000. Three new Blues Brothers join Elwood, and none of them is a sufficient replacement for Belushi... but their singing is pretty damn good.
Some folks actually thought Big Mac (John Goodman's character) came close though. But lacked the sarcastic charm of Jake's character.
Given how iconic Belushi was in the role, it's arguable that anyone who tried to fill his shoes would have found themselves facing this trope.
Sequelitis: Blues Brothers 2000 bombed at the box office. But did do better when it went to the home market.