Pluto's Blue Note (1947)

Continuity mistake: When Pluto is by the radio in the music shop, there is a record player behind him which has three buttons on the side, but in the next shot the buttons have moved a few inches to the right.

Continuity mistake: When we see Pluto's kennel at the start of the cartoon, there are initially three bricks on the left hand side of the entrance, but in the next shot there are now four.

Continuity mistake: When Pluto spots the radio outside the music shop, you can see that there is a small radio in the window, but in the next shot it has changed to a sign saying "This Week Dance Record" and two Maracas have appeared as well.