A 3-D version of this cartoon was produced for General Aniline & Film's (GAF) "View-Master" line in 1972, released in a three-reel package (21 "stereo images").
Bugs' spring footgear was an early forerunner of what would become drywall stilts and Kangaroo shoes.
Both characters break the fourth wall here.
Several older elements of a traditional circus are shown, including the "Big Top" tent and a circus band.