Continuity mistake: The door to the refrigerator is open during the party sequence at the end of the cartoon, but when we see a male duck and female duck dancing it is now closed, and in the shot after that, the door is open again.
Continuity mistake: When we see Daffy Duck all stuffed and on the mantelpiece, the time on the clock reads 5.35. But when all the other ducks fly on the window ledge and look through the window, the time is now 4.35.
Continuity mistake: When Daffy Duck pushes the vase on the mantelpiece onto Rover, you can see there are pieces of vase by the fireplace. But when Rover starts barking a little later, the pieces have disappeared.
Continuity mistake: When Daffy Duck looks through the window and sees the stuffed duck on the mantelpiece, you can see the duck is facing straight. But when Daffy goes onto the mantelpiece to meet the duck, he is now facing sideways.