Continuity mistake: When the three pigs are performing at the House of Straw, the saxophone behind the pig playing the guitar changes position between shots.
Continuity mistake: When the pig holding a guitar says "We've heard the most", you can see there is a saxophone behind him. The saxophone disappears in the next shot.
Continuity mistake: When the Three Little Bops are performing at the Dew Drop Inn, you can see there is a double bass behind the pigs when they are playing, but when the camera cuts to the piano player, the double bass has disappeared.
Trivia: There is no "That's all, Folks!" title card after the fade out. Just "The End" with white letters on a black background.