The last Warner Bros. cartoon made in Black & White.
Discernible titles in the bookcase are WEBSTER'S DICTIONARY, WE, and KLEY (around 4:46). "We" is the title of a 1921 dystopian science fiction novel, by Russian author Yevgeny Zamyatin, that anticipated two later, more famous novels in a similar vein: Aldous Huxley's "Brave New World" and George Orwell's "1984". Heinrich Kley was a German illustrator who evidently was a favorite of Izzy Ellis, who animated this portion of the scene.
Vitaphone production reel #1178A.
Remade in 1948 with Tweety and Sylvester as "I Taw a Putty Tat."