In a reference to the 3-D Bugs Bunny cartoon "Lumber Jack-Rabbit" (1954), the opening WB shield logo that normally zooms forward overshoots its mark and crashes into the screen before moving back into position.
The closing logo sequence starts with a bluegrass-themed version of "Merrily We Roll Along," but after it pauses and Porky says his "That's all, folks!" line, the theme music concludes in its traditional orchestral style.