Sylvester's canine adversaries appear to be entirely of the bulldog species, a popular character in cartoons of this era.
Sylvester does his high wire attempt accompanied by the old tune, "She Was Only an Acrobat's Daughter."
One of the few times Tweety is seen in an actual bird's nest, rather than as a pet bird (in a gilded cage).
The practice of hypnosis, an ancient art, was a popular theme in media productions of all types at the time. The hypnotist was usually seen as a nefarious, evil type of character.