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.
Cab Calloway's "Minnie the Moocher" number, from the eponymous short.
Cab Calloway's "The Old Man of the Mountain", once again from the eponymous short.
"St. James Infirmiry Blues", sung by Cab Calloway in "Snow White".
"You Gotta Have Pep", sung by Betty in "More Pep".
The entire "Hells Bells" music number from "Red Hot Mamma".
The "How'm I Doin? (hey hey)" number from "I've Heard".
The title songs of the shorts "Mysterious Mose", "Barnacle Bill" and "Any Rags?"
Ensemble Darkhorse: Betty herself in the old Bimbo cartoons, and it was her popularity that caused her to ascend to stardom while leaving Bimbo (the main character!) to fadeintoobscurity.
Esoteric Happy Ending: In "Making Friends", Pudgy ends up doing exactly what Betty wanted him to do—"Go out and make friends with the world." Unfortunately for Betty, his newfound friends happen to be a batch of rascally wild animals who proceed to tear apart Betty's house upon arrival!