Continuity mistake: When Cluck Trent leaves his office to change into Stupor Duck, the floor is completed covered in water. But when Stupor Duck enters the editor's office, look behind him and you can see the water has gone.
Continuity mistake: When the shoemaker tells the elf how he can run his business without elves, the paperwork behind the elf changes position between shots.
Continuity mistake: When we see Dorlock Holmes at his desk at the start of the cartoon, you can see that he is writing with the feather in his right hand, but in the next shot he is holding the feather with his left hand.
Continuity mistake: When Daffy (dressed as Bugs) is fishing at the pier, there is a can beside him that keeps disappearing and re-appearing between shots.