Continuity mistake: When we see Mickey Mouse's band at the start of the cartoon, look at the stand where Mickey is and you can see there is a small brown box with nothing around it. But when the camera pans in on the band in the next shot, there is now a piece of paper next to the box and on the box as well.
The Band Concert (1935)
Ending / spoiler
As the band plays on and on inside the tornado, Mickey pauses the music and begins to reverse the direction of the tornado. All the band members begin to land upon the branches of a massive tree except for one, an unfortunate Peter Pig who begins to lose his clothing one layer at a time to one individual tree branch at a time until he lands in a barrel completely naked. After Mickey finally lands and conducts the final half of the William Tell Overture showing every member of the band in and around the tree, there standing and applauding the band is Donald Duck, who pulls out one last flute only to have the band throw their instruments at him and the cartoon ends.
More mistakes in The Band Concert
Trivia: "The Band Concert" was the first Mickey Mouse cartoon made in colour.