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 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 Cluck Trent is telling us about Aardvark Ratnik, he is holding a paper cup in his left hand. When he says "This looks like a job for Stupor Duck!" we cut back to Trent, and the paper cup has disappeared.
Continuity mistake: When Cluck Trent is using his typewriter at the beginning of the short, you can see there is nothing by the machine, but when the camera closes in on Trent, a sign saying "Cluck Trent Reporter" appears.