The binding on the broom that is leaning up against the wall appears in different locations whenever the broom is shown.
After the cat gets a hot foot from the mouse and jumps in the air when he comes down the mouse hole on the wall is gone.
In the HBO Max print, instead of the correct 1938-1941 theme, the 1937-1938 theme plays over the opening titles.
As the ghost mouse runs out of town, it changes the sign with the population of ghosts from 100 to 99, subtracting himself. Yet the ghost of the cat supposedly remains, making the population of 100 ghosts still.