the man is not a bum, and his place is not a dump. He is a caveman somehow surviving into the 20th century, and this is how he lives. The curtain rod is the give away - it's not bent metal, it's a stick! The bowl of meat is the punch line.

No cat. No parrot. No bluebird or flies or Bart Simpson or anything else. If you think about it, putting out a bowl of meat is kinda funny all by itself. In this context, it's a bit funnier. Not Larson's greatest, but not bad.