The detective is modeled on veteran character actor Fred Kelsey, who specialized in playing dumb or naive but persistent detectives, and who almost always wore a derby.
The use of an organ instead of a traditional orchestral score is designed to emulate the radio mysteries that the cartoon is spoofing.
The Murderer's only quote, "I dood it!" is also the title of a theatrical movie comedy, starring Red Skelton in 1943's I Dood It (1943). The murderer may have been Red Skelton with an uncredited role. The "I dood it." quote was said last before closing credits begin. Theatrical movie & short were both filmed by MGM aka Metro Goldwyn Mayer theatre studios.