Looney Tunes

On-screen title card, used from 1947-1948.

Looney Tunes is an American animated comedy theatrical short film series produced by Warner Bros.

Throughout the years, both Hanna-Barbera and Looney Tunes have made several references to one another.

Connections

Main article: Blast-Off Buzzard

The Blast-Off Buzzard shorts themselves share similarities to the Wile E. Coyote and Road Runner theatrical shorts.

Main article: Fantastic Max

At the end of the episode, "Movie Star Max," there's a sequence where Max pops out to tell the viewers, "Th-th-that's it, folks!"

Main article: Flintstones (franchise)

In the Baby Looney Tunes episode, "The Wheel Deal," the Flintmobile makes a cameo when Bugs and the others are trying to make a brand new bike to fit Tweety's size.
In celebration of Warner Bros.' 100th anniversary, they produced a special short which reimagined Looney Tunes characters taking a group photo together in Bedrock, but this is spoiled by Daffy who comes dressed as Fred and then Bamm-Bamm, even though Bugs and Sylvester were already covering them respectively.

Main article: Hokey Wolf

The Hokey Wolf episode, "Robot Plot," was likely inspired by the 1953 Looney Tunes short, Robot Rabbit.

Main article: It's the Wolf

The It's the Wolf shorts took partial inspiration from the Ralph Wolf and Sam Sheepdog shorts.

Main article: Scooby-Doo (franchise)

Scooby and Shaggy make cameos at the WB cafeteria in Looney Tunes: Back in Action, where they are voiced by Frank Welker and Casey Kasem respectively.
Wile E. Coyote and Road Runner make cameo appearances in the What's New, Scooby-Doo? episode "New Mexico, Old Monster," with the Road Runner's voice being from an archival recording of Paul Julian.
- Tweety also makes a cameo in Avery's bird watching guidebook.
For Warner Bros.' 100th anniversary, they teamed up with Funko to release Looney Tunes Pops with a Scooby-Doo motif. A crossover short was made for Cartoon Network's Acme Fools month-long marathon, based on the same Funko Pop renderings with the Looney Tunes cast as Mystery Inc. attempting to unmask the Ghost of Mr. Hyde.
In the Velma episode "Private Velmjamin," Fred wants to return a nativity miniature model with the Looney Tunes to Father O'Rourke, after Fred briefly became Catholic. Elmer Fudd is baby Jesus, Sylvester is Joseph, Granny is Mary, and Daffy, Porky, and Bugs are the three wise men.

The concept for the unrealized project, Toing Tiger likely became the character Cool Cat.