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.
Deduce, You Say (1956)
1 mistake - chronological order
Directed by: Chuck Jones
Starring: Mel Blanc, June Foray
Dorlock Holmes: I may be down, but the jig is up.
Trivia: There is a sign at the "Henry the Eighth's Fifth" advertising "Selzer's Water" - a reference to the Warner Brothers producer Eddie Selzer.