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 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.
Trivia: When Cluck Trent (Daffy) takes a break from writing, he pulls out from his pocket a box of "Dr. Pierce's Mild Pills" - a reference to the Warner Brothers story writer, Tedd Pierce.