This cartoon features a newly-recorded version of the Looney Tunes theme (the 1960s version of "The Merry-Go-Round Broke Down") that was used on this short and See Ya Later Gladiator (1968). The closing theme was left unchanged.
From this cartoon onward, the Merrie Melodies and Looney Tunes series swapped releasing companies, meaning that Looney Tunes began to use the "A Vitaphone Release" byline and Merrie Melodies began to use the "A Vitagraph Release" byline, although the previously released Looney Tunes cartoon Hippydrome Tiger (1968) also had the "A Vitaphone Release" byline. The swap may have been done to protect Warner Bros.-Seven Arts' ownership of the trade names Vitaphone and Vitagraph, which were both largely defunct.
The melody of the calliope music that plays when Cool Cat enters the circus would later be used for the opening of "The Merrie Melodies Show" in 1972, and an abbreviated version of the theme would also be used for cartoon title cards in "The Bugs Bunny Road Runner Hour" that subsequently got used for other TV showings of the Looney Tunes and Merrie Melodies cartoons that omitted the original opening and closing sequences.