The Cat Who Knew Too Much is the first episode of The Sylvester and Tweety Mysteries.
Granny has started a detective agency, with the help of Sylvester and Tweety. The mysteries take them all around the world. Sylvester is still attempting to eat Tweety, but sometimes they are allies.
- Louie Z. Anna entered Daffy Duck in last year's contest, as seen in the photo Granny finds. In the photo, Daffy is coated entirely in yellow coloring.
- Louie Z. Anna's character design closely resembles those of Colonel Shuffle.
- Rocky and Mugsy also made an appearance helping the other two bad guys.