The backgrounds in THE UNBEARABLE BEAR are way ahead of their time for 1943. Director Chuck Jones experiments with large abstract mono-color blocks to suggest settings rather than the traditional more detailed drawings. Jones would return to, and expand upon this technique in cartoons he directed from the late 1940's through the 1960's.
Vitaphone production reel #995A.
THE UNBEARABLE BEAR has no credits for the artists, voice actors, music, or director in the opening titles. This is extremely unusual for a Warner Brothers cartoon of the period.