Revealing mistake: In the scene out West with the buffalo, notice the car driving in the distant background.
Continuity mistake: When they are dancing the king's earring is on his left ear then it somehow jumps across to the other ear.
Other mistake: When Stupor Duck looks into the mirror and sees that the shoulder pads on his costume are positioned incorrectly, look at the mirror and you can see that the "S" on his costume is the right way round - it should be back to front.
Continuity mistake: When Elmer Fudd appears at the shoemaker's new business office, you can see there is a fountain pen on the desk. When the shoemaker pulls out all the orders in his filing cabinet to show Elmer, the fountain pen has gone.
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.