This cartoon is teased in a print article about Bobo the Elephnt being the last non-human baseball player before Toony joins the Gotham Nine; image of Bobo shown on tabloid cover.
After colliding in the outfield, two Goons players say, "Which way did he go? Which way did he go?" à la Lon Chaney Jr.'s portrayal of Lennie in the film.
Bobo the elephant is a spoof of Disney's Dumbo. And like Dumbo (the circus elephant), Bobo (the baseball elephant) was reticent at first, and needed to be stuck with a pin.