"The Band Concert", the first color Mickey Mouse cartoon, has a great running gag where ice-cream peddler Donald derails the band's "William Tell Overture" by playing "Turkey in the Straw" on a fife. Mickey keeps snatching the fife away and snapping it in two; Donald keeps producing another one from thin air and continuing. At one point the trombonist grabs Don by the neck with the horn's slide and shakes him violently, sending dozens of fifes flying from his person.
There's a lovely scene in "Mickey and the Beanstalk" where Mickey, Donald, and Goofy are eating dinner. It's a slice of a single bean and two thin slices of bread. Donald frowns at the sandwich when he looks at it vertical and we can see the bread is so thin as to be translucent, looks along its length, keeps frowning, and then completely loses it, yelling at the Narrator to "SHUT UP!"
"Mickey's Fire Brigade" - as Mickey, Donald, and Goofy fight a fire in an apartment building, they hear what sounds like a scream for help behind a door. When Goofy looks in through a transom window, it turns out to be Clarabelle Cow, oblivious to the fire, singing in the bathtub. She sees Goofy staring in at her and starts shrieking at the Peeping Tom. He tries to explain the situation, but is so flustered that he can't put three words together through his guffawing.
In "The Picnic", Mickey tries to salvage his picnic supplies when it starts raining and various animals (who've been raiding the picnic earlier) scurry out of the blanket, the basket and even the phonograph.
In "The Nifty Nineties", Mickey puts his car to full speed and tells Minnie "Here we go!". The top speed is 15 mph.
Narrator: You can do practically everything you normally do. (The waltzing couple transition into dancing the jitterbug, their clothing changing appropriately.) Narrator: Oh, come now! We said practically everything. (Everything goes back to waltz abruptly.)