Alternate Character Interpretation: Some have speculated that the frog is deliberately not singing for the man in order to get him in trouble. Some even speculated that the man was hallucinating the frog dancing, but this has obviously been Jossed. The ending to "Another Froggy Evening" suggests that the frog will sing if properly asked. And that it isn't croaking, it's saying: "Do you want another song ?" in martian language. Which Marvin the Martian ends up being the only one to understand.
Broken Base: It's been observed that, like Michigan J. Frog, the cartoon itself only "performs" for certain people.
Newer Than They Think: "Michigan Rag". Unlike the rest of the songs in One Froggy Evening, this wasn't old, but created specifically for the short by Chuck Jones, Mike Maltese, and composer Milt Franklyn.
The Woobie: Admit it, you felt bad for that guy at some point or another.